FR584932A - Speakerphone - Google Patents
SpeakerphoneInfo
- Publication number
- FR584932A FR584932A FR584932DA FR584932A FR 584932 A FR584932 A FR 584932A FR 584932D A FR584932D A FR 584932DA FR 584932 A FR584932 A FR 584932A
- Authority
- FR
- France
- Prior art keywords
- speakerphone
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
- H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR584932T | 1924-05-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR584932A true FR584932A (en) | 1925-02-18 |
Family
ID=8959648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR584932D Expired FR584932A (en) | 1924-05-20 | 1924-05-20 | Speakerphone |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR584932A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4122314A (en) * | 1976-12-23 | 1978-10-24 | Sony Corporation | Loudspeaker having a laminate diaphragm of three layers |
-
1924
- 1924-05-20 FR FR584932D patent/FR584932A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4122314A (en) * | 1976-12-23 | 1978-10-24 | Sony Corporation | Loudspeaker having a laminate diaphragm of three layers |
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