US1727039A - Duplicate sound record and process of making the same - Google Patents
Duplicate sound record and process of making the same Download PDFInfo
- Publication number
- US1727039A US1727039A US621108A US62110823A US1727039A US 1727039 A US1727039 A US 1727039A US 621108 A US621108 A US 621108A US 62110823 A US62110823 A US 62110823A US 1727039 A US1727039 A US 1727039A
- Authority
- US
- United States
- Prior art keywords
- record
- sound
- shellac
- making
- same
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title description 2
- 229920001800 Shellac Polymers 0.000 description 14
- 229940113147 shellac Drugs 0.000 description 14
- 239000004208 shellac Substances 0.000 description 14
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 14
- 235000013874 shellac Nutrition 0.000 description 14
- 239000000203 mixture Substances 0.000 description 13
- 229920002678 cellulose Polymers 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 229920002160 Celluloid Polymers 0.000 description 7
- 229920002301 cellulose acetate Polymers 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 3
- 244000144992 flock Species 0.000 description 3
- 239000006233 lamp black Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- 229920001220 nitrocellulos Polymers 0.000 description 3
- 229940079938 nitrocellulose Drugs 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 description 2
- 241000723346 Cinnamomum camphora Species 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 229960000846 camphor Drugs 0.000 description 2
- 229930008380 camphor Natural products 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000000135 prohibitive effect Effects 0.000 description 2
- SSZWWUDQMAHNAQ-UHFFFAOYSA-N 3-chloropropane-1,2-diol Chemical compound OCC(O)CCl SSZWWUDQMAHNAQ-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920013683 Celanese Polymers 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- 229920000699 Galalith Polymers 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-N Propionic acid Chemical class CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 150000001558 benzoic acid derivatives Chemical class 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000004648 butanoic acid derivatives Chemical class 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- -1 coloring matter Substances 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 150000004675 formic acid derivatives Chemical class 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 125000005498 phthalate group Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010458 rotten stone Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/68—Record carriers
- G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
Definitions
- This invention relates to im roved, duplicating sound records, tablets, disks or other bodies to be usedin sound recording and sound reproducing machines, of tough, flexible, permanent material, capable of receiving and retaining an impression thereon and an accurate copy of the matrix, containing no ingredient which will'evaporate or distort or otherwise injuriously affect the permanency or value of the record surface, at the same time practically non-inflammable, and this invention relates to the production of a duplicate soundrecord of this improved, impressionable material.
- Sound records made by my im rovedprocess are superior to those hereto ore made in the respects, firstly, that the obtained impression is provided with a true cast surface, the material having no tendency to alter in composition, condition or form, and therefore retaining the record impression unimpaired in accuracy and tonal qualities for an indefinite period; and secondly, that the record can be made of less thickness and lighter weight than has been customary heretofore, with perfectly solid and homogeneous walls, there bein no 1 tendency inthe finished record to crack, ake, peel or warp, or to soften at normal summer temperatures.
- Sound records used for phonographs, gramophones and similar apparatus give blurred, indistinct and impure .tones after a 4 very short use. This is usually due to microscopically small injuries to the edges of the sound grooves, or to the sound reproducing stylus cutting into the grooves themselves from the brittleness or softness of the foundation material of shellac, rosin, pitch, asphalt I and the like, used for making such sound records.
- Celluloid is also highly inflammable. When celluloid shrinks, its tension then becomes so altered as to warp the record. Furthermore, celluloid is too hard, and produces shrill, harsh tones.
- Shellac has desirable properties of thermoplasticity, softening at a temperature slightly above the temperature of Shellac at the present time is used in large boiling water and being sufficiently rigid at z ordinary atmospheric temperatures to render sound waves made thereon, quite durable.
- shellac is a natural product of varying composition and properties, and subject to extensive adulteration. It must be imported from long distances, and is subject to market manipulation. In recent years the eostof shellac has risen to a point where its use is almost prohibitive, and forms a menace to the continued expansion of this industry. While many. substitutes for shellac have been brought forward and patented, the majority of these are lacking in the desirable property of thermoplastioity, or are obtainable in insufficient commercial quantitiesandat a prohibitive price.
- Synthetic resins such as the phenol-aldesuited for general molding purposes, when used as phonograph record masses, require too long a time in the impression molds to render their use in sound records useful on account of materially diminished speed of production.
- the specific cellulose ester which I prefer to employ being the cellulose acetates, although the use of other cellulose esters of a similar nature and de ree of inflammability, such as, forexample, the cellulose 'formates, butyrates, propionates, phthalates and benzoates, would ,fall within the scope of my invention when used for this purpose.
- recrd bodies are produced wanting in the undesirable properties previously mentioned,
- thermoplasticity is such that an unduly high pressure on the steam tables is avoided, and hence the nickeled matrix will produce a large number of impressions before being discarded due to wear.
- This powder is then placed on the malaxatin'g rolls of hot and cold hollow cylinders, and a steam pressure admitted to the hot cylinder in amount depending upon the nature and amount of plastifying portion present in the mixture. From the malaxating' rollers, the mass is then run onto an endless belt through a marker which cuts out rectangles approximating the weight of an indic vidual record. These rectangles are then softened on the steam table, rolled into a ball,
- memes of cellulose,and non volatile cellulose ester plasticizer employed, will .vary depending cellulose ester employed.
- I may employ any non-volatile product which works harmoniously with shellac or shellac substitutes, or I may omit theme of a cellulose ester plastifier entirely, and depend upon the shellac and cellulose ester for the plasticity of the sound record composition.
- cellulose acetate and plastifier for the same in amounts from 25 percent to 50 percent of the weight of the completed batch, and depending upon the amount of shellac also present, a specific example of a satisfactory mixture embodying my invention being as follows To 100 pounds of finely ground record stock from which the paper from the labels has been removed, and the iron taken therefrom electrically, is added 100 lbs. rotten stone, 75 lbs. china clay, 40 lbs. mica, 5.1bs. lampblack, and 10 lbs. cotton flock, and the mixture thoroughly intermingled. There is then added 70 lbs. finely ground orange shellac and 80 lbs. cellulose acetate or cellulose acetate and non-volatile plastifier, the mass ance y further mixing.
- This mixture is then transported to the mixing .rolls and manipulated until the mass has sheeted, when it is marked out into individual record masses, softened-on the steam table, placed under the reproducing matrices, heat and pressure applied to the record mass, when a commercial record results.
- the manipulation of this mixture on the malaxating rolls naturally differs 'from that in which the plasticity is entirely due to shellac. In general, less time and a lower steam pressure is required, resulting ingreater production per unit working force, and notable coal saving.
- the record may be colored black with 130 lam black, or if large amounts of red iron OXlf e be used, the finished record will be of the corresponding color.
- a composition for phonograph records comprising 100 pounds rotton stone, 100 pounds finely ground record mass, 75 pounds china clay, 40 pounds mica, 5 pounds lamp black, 10 bounds cotton flock, 10 pounds orange shellac, and 80 poundsof plastifier composed of cellulose acetate to which a nonvolatile solvent of the same has been added in suitable proportions.
Landscapes
- Heat Sensitive Colour Forming Recording (AREA)
Description
Patented Sept. 3, 1929.
1,7z1,639. UNITED STATES PATENT OFFICE. V
LEO nursrnm,
No Drawing.
- This invention. relates to im roved, duplicating sound records, tablets, disks or other bodies to be usedin sound recording and sound reproducing machines, of tough, flexible, permanent material, capable of receiving and retaining an impression thereon and an accurate copy of the matrix, containing no ingredient which will'evaporate or distort or otherwise injuriously affect the permanency or value of the record surface, at the same time practically non-inflammable, and this invention relates to the production of a duplicate soundrecord of this improved, impressionable material.
Sound records made by my im rovedprocess are superior to those hereto ore made in the respects, firstly, that the obtained impression is provided with a true cast surface, the material having no tendency to alter in composition, condition or form, and therefore retaining the record impression unimpaired in accuracy and tonal qualities for an indefinite period; and secondly, that the record can be made of less thickness and lighter weight than has been customary heretofore, with perfectly solid and homogeneous walls, there bein no 1 tendency inthe finished record to crack, ake, peel or warp, or to soften at normal summer temperatures.
By my composition a record mass results which has the desirable properties of flexibility, toughness, elasticity, resiliency, water- 'insolubility and non-'inflammability, possessing also great tensile strength, and hence satisfactory wearing qualities combined'with den; sirable acoustics and sound reproductionproperties.
Sound records used for phonographs, gramophones and similar apparatus give blurred, indistinct and impure .tones after a 4 very short use. This is usually due to microscopically small injuries to the edges of the sound grooves, or to the sound reproducing stylus cutting into the grooves themselves from the brittleness or softness of the foundation material of shellac, rosin, pitch, asphalt I and the like, used for making such sound records. Many attempts have been made to overcome this drawback by incor orating in the foundation material such pro ucts as cel- 9 luloid, xylonite, pyroxylin, galalith, indurated gelatin, vulcanite and ebonite, which materials, however, have proven unsuitable in many respects. Celluloid'which has been particularly recommended, gradually changes 5 in shape due to volatilization of camphor and OF NEWARK, NEW JERSEY, ASSIGNOR TO 'CELANESE CORPORATION OF AMERICA, A CORPORATION OF DELAWARE.
DUPLICATE SOUND RECORD AND PROCESS OF MAKING THE SAME.
Application filed February 24, 1923. Serial No. 621,108.
camphor substitutes contained therein, resulting m'distortion of the record and impair= ment of its tonal qualities. Celluloid is also highly inflammable. When celluloid shrinks, its tension then becomes so altered as to warp the record. Furthermore, celluloid is too hard, and produces shrill, harsh tones.
quantities in this connection, but it has its limitations. Shellac has desirable properties of thermoplasticity, softening at a temperature slightly above the temperature of Shellac at the present time is used in large boiling water and being sufficiently rigid at z ordinary atmospheric temperatures to render sound waves made thereon, quite durable. But shellac is a natural product of varying composition and properties, and subject to extensive adulteration. It must be imported from long distances, and is subject to market manipulation. In recent years the eostof shellac has risen to a point where its use is almost prohibitive, and forms a menace to the continued expansion of this industry. While many. substitutes for shellac have been brought forward and patented, the majority of these are lacking in the desirable property of thermoplastioity, or are obtainable in insufficient commercial quantitiesandat a prohibitive price.
Synthetic resins such as the phenol-aldesuited for general molding purposes, when used as phonograph record masses, require too long a time in the impression molds to render their use in sound records useful on account of materially diminished speed of production. When it is remembered that a ,complete record should be molded within a it has been s5 'hyde condensation products, while admirably are used through the record mass, the specific cellulose ester which I prefer to employ being the cellulose acetates, although the use of other cellulose esters of a similar nature and de ree of inflammability, such as, forexample, the cellulose 'formates, butyrates, propionates, phthalates and benzoates, would ,fall within the scope of my invention when used for this purpose. By my invention, recrd bodies are produced wanting in the undesirable properties previously mentioned,
butof the requisite degree of toughness coupled with a sulficient degree of hardness, readily workable through the malaxating rolls and on the steam table, ahd resulting in the production of a record wherein the requisite degree of toughness and hardness is obtained, and a material improvement in the tone and in the details of the phonetic record. Furthermore, when operating according to my invention, the thermoplasticity is such that an unduly high pressure on the steam tables is avoided, and hence the nickeled matrix will produce a large number of impressions before being discarded due to wear.
As will readily be understood by those versed in the art, in order to have a faithful reproduction of music or of the voice, the impression upon the master record must reproduce in theminutest detail the microscopic sound undulations, otherwise the reproduction sounds mufiied and possesses other disagreeable properties.
In producing a sound record composition according to my invention, I first weigh out the desired amounts of each of the inorganic filling materials such as clay, barytes, gypsum, kieselguhr', mica or red iron oxide, to
which is usually added in a manufacturing way, a proportion of waste record material from previous manufacture and ground records, this mixture being then mechanically mixed to a homogeneous, finely divided powder. Coloring matter as lampblack, and binder as finely divided cotton flock may then be incorporated by mixing, after which an amount of powdered shellac, in quantity de-' pending upon'the amount of organic cellulose ester required is added, and mixing continued until a mass of uniformity in appearance to the eye results. Finally the uninflammable cellulose ester with plastifieris" added, there being no volatile solvent required in the entire mixture, and mixing continued until the powder is apparentlyhomogeneous. This powder is then placed on the malaxatin'g rolls of hot and cold hollow cylinders, and a steam pressure admitted to the hot cylinder in amount depending upon the nature and amount of plastifying portion present in the mixture. From the malaxating' rollers, the mass is then run onto an endless belt through a marker which cuts out rectangles approximating the weight of an indic vidual record. These rectangles are then softened on the steam table, rolled into a ball,
' inserted under the reproducing matrix, and
steam and pressure then form the finished record, which, after removal, trimmin oif the burr on the edge, becomes the fimshed record of commerce. It will be obvious to those skilled in the art, that the proportions of filling materials, coloring matter, binder,
memes of cellulose,and non volatile cellulose ester plasticizer employed, will .vary depending cellulose ester employed. I may employ any non-volatile product which works harmoniously with shellac or shellac substitutes, or I may omit theme of a cellulose ester plastifier entirely, and depend upon the shellac and cellulose ester for the plasticity of the sound record composition.
I employ an amount of cellulose acetate and plastifier for the same in amounts from 25 percent to 50 percent of the weight of the completed batch, and depending upon the amount of shellac also present, a specific example of a satisfactory mixture embodying my invention being as follows To 100 pounds of finely ground record stock from which the paper from the labels has been removed, and the iron taken therefrom electrically, is added 100 lbs. rotten stone, 75 lbs. china clay, 40 lbs. mica, 5.1bs. lampblack, and 10 lbs. cotton flock, and the mixture thoroughly intermingled. There is then added 70 lbs. finely ground orange shellac and 80 lbs. cellulose acetate or cellulose acetate and non-volatile plastifier, the mass ance y further mixing. This mixture is then transported to the mixing .rolls and manipulated until the mass has sheeted, when it is marked out into individual record masses, softened-on the steam table, placed under the reproducing matrices, heat and pressure applied to the record mass, when a commercial record results. The manipulation of this mixture on the malaxating rolls, naturally differs 'from that in which the plasticity is entirely due to shellac. In general, less time and a lower steam pressure is required, resulting ingreater production per unit working force, and notable coal saving.
Records produced as above have an unusually high tensile strength, give sound reproductionsv remarkable for their fidelity and sonority, are less liable to breakage, not so prone to soften at' elevated temperatures, and
are somewhat lighter in weight. Due to the.
In the illustrative formula above given, satisfactory results are obtained with 50 lbs. steam pressure on the malaxating rolls, and
from .50 to 60 lbs.steam on the steam table where-the record is formed from the plastic mass. The record may be colored black with 130 lam black, or if large amounts of red iron OXlf e be used, the finished record will be of the corresponding color.
It may he mentioned that while it is old to make sound records from celluloid or nitrocellulose, or to provide such records with a coating of celluloid or of nitrocellulose, or to coat phonographic records with an extremely thin film of cellulose ester preparatory to the impression of the phonetic writing by applying a cellulose ester in a volatile solvent as a chlorhydrin; and while it is old to use such materials as paraffin, chlorinated fatty acids,
adjuncts to the cellulose acetate, or of softening the record mass by the introduction of paraffin or other fatty or waxy materials acting similarly I disclaim all these, but what I do claim and desire to secure by Letters Patent is:-
A composition for phonograph records comprising 100 pounds rotton stone, 100 pounds finely ground record mass, 75 pounds china clay, 40 pounds mica, 5 pounds lamp black, 10 bounds cotton flock, 10 pounds orange shellac, and 80 poundsof plastifier composed of cellulose acetate to which a nonvolatile solvent of the same has been added in suitable proportions.
This specification signed this nineteenth day of February, 1923.
' LEO RUTSTEIN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US621108A US1727039A (en) | 1923-02-24 | 1923-02-24 | Duplicate sound record and process of making the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US621108A US1727039A (en) | 1923-02-24 | 1923-02-24 | Duplicate sound record and process of making the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US1727039A true US1727039A (en) | 1929-09-03 |
Family
ID=24488755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US621108A Expired - Lifetime US1727039A (en) | 1923-02-24 | 1923-02-24 | Duplicate sound record and process of making the same |
Country Status (1)
Country | Link |
---|---|
US (1) | US1727039A (en) |
-
1923
- 1923-02-24 US US621108A patent/US1727039A/en not_active Expired - Lifetime
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