EP0216223A1 - Mittelteilwerkplatte für eine Uhr, Verfahren zur Herstellung dieser Mittelteilwerkplatte und eine mit einer solchen Mittelteilwerkplatte ausgerüstete Uhr - Google Patents
Mittelteilwerkplatte für eine Uhr, Verfahren zur Herstellung dieser Mittelteilwerkplatte und eine mit einer solchen Mittelteilwerkplatte ausgerüstete Uhr Download PDFInfo
- Publication number
- EP0216223A1 EP0216223A1 EP86112263A EP86112263A EP0216223A1 EP 0216223 A1 EP0216223 A1 EP 0216223A1 EP 86112263 A EP86112263 A EP 86112263A EP 86112263 A EP86112263 A EP 86112263A EP 0216223 A1 EP0216223 A1 EP 0216223A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- middle plate
- faces
- layer
- coating
- watch
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000010410 layer Substances 0.000 claims description 38
- 229910001369 Brass Inorganic materials 0.000 claims description 22
- 239000010951 brass Substances 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 239000011241 protective layer Substances 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 10
- 229910052737 gold Inorganic materials 0.000 claims description 10
- 239000010931 gold Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000011368 organic material Substances 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 239000011247 coating layer Substances 0.000 claims 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims 1
- 239000011253 protective coating Substances 0.000 abstract description 4
- 239000011521 glass Substances 0.000 description 13
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 238000000151 deposition Methods 0.000 description 7
- 238000003754 machining Methods 0.000 description 7
- 230000008021 deposition Effects 0.000 description 5
- 210000000078 claw Anatomy 0.000 description 4
- 210000005069 ears Anatomy 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 206010001488 Aggression Diseases 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000016571 aggressive behavior Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 239000002320 enamel (paints) Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B29/00—Frameworks
- G04B29/02—Plates; Bridges; Cocks
- G04B29/027—Materials and manufacturing
Definitions
- the main object of the present invention is a base plate for a watch, made of brass; this middle plate includes lower and upper faces, at least one being provided with recesses intended to receive components of a watch movement, as well as lateral faces. It is also provided with a coating made of a chemically more inert material than brass.
- the plates are generally coated with a layer of nickel, itself covered or not with gold. Their total thickness generally does not exceed 2 ⁇ m. This is enough to protect the brass, while minimizing the dimensions of the plates.
- the brass is coated with a layer of chrome, gold, or any other protective material.
- the protective layer of the box must be much more resistant than that of the plates, because it is subjected to numerous physical and chemical attacks. Consequently, a layer of 2 tJm is not sufficient.
- the thickness is generally at least 5 ⁇ m and can exceed 20 ⁇ m. Such thicknesses deposited on the plate would considerably increase the dispersion of the size value, thus making the plates unsuitable for automated assembly of the components.
- Swiss patent 250,700 envisages this and proposes to produce the platinum part in brass and the middle part in steel, these two parts being assembled by welding or forcing. If at first glance this method of doing seems attractive, we also understand that the enormous tensions that it can generate may distort the platinum part so as to make it unsuitable for automated assembly.
- French patent application 2,085,292 proposes aluminum, copper, metal alloys and synthetic materials as the material which can be used for the production of a base plate, without considering the deposition of a protective layer. None of these materials seems to allow machining of the platinum part sufficiently precise to allow automated assembly, except for an alloy such as brass which, because of its sensitivity to oxidation, must include a protective coating.
- An object of the present invention is to produce a middle plate as described above, but the middle part of which offers good resistance to chemical and physical attack, without however assembling the movement components. of the watch is complicated. This object is achieved thanks to the fact that the middle plate has the characteristics set out in claim 1.
- the present invention also relates to a method for manufacturing square plates.
- Another object of the present invention is to reduce these costs.
- the shoulders and more particularly their exposed surfaces are machined piece by piece, which also increases the manufacturing cost.
- the chips and the machining lubricants risk altering the surface condition of this layer.
- Another object of the present invention is to reduce the manufacturing cost while allowing machining after deposition of this layer, without risk of alteration.
- the present invention also relates to a watch provided with a middle plate according to claim 1.
- a middle plate according to claim 1.
- Another object of the present invention is to solve this problem.
- the watch shown in FIGS. 1 to 3 comprises a middle plate 10 carrying different components of the watch movement, a crystal 12 and a base 14 which protect these components, as well as a bracelet 16.
- the middle plate 10 comprises a first part 18 forming the middle part, of annular shape, and a second part 20, surrounded by the part 18 and forming the plate.
- the part 18 forming the middle part comprises an upper face 22, a lower face 24 on which the glass 12 and the base 14 respectively bear, and lateral faces 26.
- the face 22 has a peripheral groove 28 in which is housed a seal 30 which seals between the middle plate 10 and the crystal 12.
- the face 24 has a peripheral groove 32 in which is housed a seal 34 which seals between the middle plate 10 and the base 14.
- the lateral faces 26 comprise, in opposite positions, two ears 36 each provided with a support surface 38 and a groove 40.
- the support surfaces 38 are parallel to the faces 22 and 24. They act as support to claws 42 intended to fix the glass 12, by pressing a spout 42a which cooperates with a bevel 12a of the glass 12 (Fig. 2).
- the claws 42 are made integral with the ears 36 by screws 44 each engaged in a cylindrical hole 46 which the ears 36 have and tightened in tapped holes 48 which are each provided with the claws 42.
- a bar 50 serving as attachment to the bracelet 16, is engaged in each of the grooves 40 and held by the claw 42.
- the part 20 forming a plate comprises recesses 52, which define clearances, in which are housed different watch components.
- the display means formed by needles 54 can be noted, as well as the parts constituting the drive, control and correction means of the display means, shown diagrammatically at 58.
- the precision required is much greater. This is due to the fact that the hole 52b, which takes the place of pivoting to a mobile 58a, must have a perfectly defined diameter and position to guarantee a good meshing of the various mobiles of the watch.
- a layer 60 of a noble or passivable material such as gold or nickel, the thickness of which is between 0.5 and 3 ⁇ m, typically 2 v m.
- This protective layer 60 is more than sufficient to maintain the appearance of the part 20, which is protected from external attack by the glass 12 and the bottom 14. On the other hand, it is not at all suitable for protecting the lateral faces 26 , which are subjected to physical aggressions such as abrasion or shocks and to chemical aggressions, for example by sweat. To solve this problem, the lateral faces 26, as well as the parts of the lower face 24 not covered by the bottom, are coated with a layer 62 of a material chemically more inert than brass and more resistant to chemical and physical attack. than layer 60.
- This material can be chromium, gold, titanium, aluminum or carbide or nitride of a metal chosen from titanium, vanadium, tungsten, or even a layer of organic material such as paint or rubber.
- the layer 62 is one of these metals or metallic compounds, its thickness is advantageously between 5 ⁇ m and 30 ⁇ m, typically 10 ⁇ m. It gives exposed areas a resistance far greater than that which can be expected from a brass part, even protected by means of the layer 60 of nickel or gold, as is the case with the platinum part.
- the layer When the layer is made of gold, its thickness generally exceeds 8 vm to be able to benefit from the designation "gold plated”.
- the layer When the layer is made of galvanically deposited aluminum, it has a thickness of between 20 and 30 ⁇ m. This layer is then oxidized, also galvanically, to harden and color it.
- the deposition of the aluminum layer can be carried out according to the method described by U. Landau: report of the conference "INTERFINISH EUROPE” Berlin 1985, pages 317 to 324.
- the layer 62 is made of rubber, its thickness is advantageously between 0.5 and 1 mm.
- the seals 30 and 34 can advantageously be molded in one piece with the protective layer 62.
- layer 62 by means of paint, generally enamel paint, advantageously deposited by electrophoresis.
- the middle portion 18 of the middle plate 10 projects beyond the glass 12 and the bottom 14, and has peripheral bevels.
- the part 18 of the middle projecting from the bottom 14 and the crystal 12 is entirely covered with the protective layer 62, represented by a thick line.
- the glass and the bottom are advantageously aligned vertically with respect to each other.
- the part 18 projecting from the glass 12 and the bottom 14 is entirely covered by the protective layer 62.
- the lateral face 26 is connected to the faces upper 22 and lower 24 by rounded 63.
- part 18 can take are very numerous. For each, however, the brass must be provided with the protective layer 62 in the parts not covered. It goes without saying that this layer may overflow onto the parts covered by the bottom or the glass for example; but it is necessary that the surfaces of the recesses 52 are free of it for the reasons mentioned above.
- turntables such as those shown in Figures 1 to 5 are done starting from a brass band in which are cut plates, any shape, preferably round or rectangular and whose dimensions are greater than those of the turntables completed. These plates are thick and machined so as to produce the clearances 52 intended to receive the components and holes such as the working holes making it possible to position the plate during the manufacturing operations or the holes intended to form the bearings of the mobiles. .
- the middle plates are then cleaned and coated, generally by galvanic means, with the protective layer 60.
- the part 20 and the faces 22 and 24 thus have their final surface state.
- against by the side faces 26 are still in the rough. They must be machined to define the periphery of the part forming the middle part 18 and to make means for fixing the bracelet. These operations differ significantly from those during which the platinum part is machined. If the required precision is less, the surface condition on the other hand must be without imperfection. In addition, the shape must be easily changed from one room to another, so as to increase the possibilities of aesthetic creation.
- This support has a base 64, positioning rods 66, only one of which is visible in the drawing, an upper plate 68 and screws 70.
- the base 64 and the plate 68 each further comprise a lug 71, visible only on the plate 68 and intended to fix the stack on the machine tool.
- the base 64 and the plate 68 are advantageously made of brass and of dimensions equal to those of the base plates 10 before machining.
- the plates 10 are threaded on the rods 66, each rod having a position corresponding to a working hole that includes the middle plate.
- the free end of each rod 66 has a tapped hole intended to receive one of the screws 70.
- the assembly is mounted on the machine tool, a numerically controlled milling machine for example.
- the periphery is then defined by milling.
- the surface finish can be refined by brushing, sanding or polishing for example.
- the stack is then cleaned. After which it is placed in an enclosure allowing the deposition of the coating material by chemical vapor phase, known by the abbreviation CVD or by physical vapor phase known by the abbreviation PVD.
- CVD chemical vapor phase
- PVD physical vapor phase
- the layer covering the middle part is made of gold, aluminum or chromium for example, it can be deposited galvanically, the middle plates 10 being stacked in the same manner as just described.
- This procedure allows the external shape of the parts forming the middle part to be machined and the protective coating to be deposited on a large number of parts at the same time, the adjacent faces of two neighboring plates being mutually masked, while the external faces of the plates. ends are covered by the base 64 and the plate 68.
- the middle plates 10 are no longer simply stacked one directly above the other, but spacers 72 are interposed between them as can be seen in FIG. 7. These spacers cover the zones which, after assembly of the watch, are protected by the crystal 12 and the bottom 14. As we said previously, if the bottom 14 is aligned with the glass 12, it suffices to make spacers 72 having a surface identical to that of the glass and the bottom.
- the thickness of the spacer 72 is chosen to be as small as possible, but sufficient however to guarantee a deposit of material up to the bottom of the groove formed by two superimposed plates 10. This result can be obtained when the depth of the groove is substantially equal to the thickness of the spacer.
- the layer 62 can overflow under the bottom 14 or the glass 12, without disturbing the proper functioning of the watch. It suffices for this that this layer 62 does not protrude into the plate forming part 20 of the middle plate 10.
- the crystal is directly fixed to the middle plate 10. It could also be secured to a bezel, this bezel itself being fixed to the middle plate 10.
- the lower and upper faces could be of any shape, adapted to receive a bottom and a glass of more complex structure.
- shape of the spacers should be chosen so as to be complementary to the shape of the surfaces with which they collaborate.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electroplating Methods And Accessories (AREA)
- Physical Vapour Deposition (AREA)
- Electromechanical Clocks (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH385785A CH662034GA3 (de) | 1985-09-06 | 1985-09-06 | |
CH3857/85 | 1985-09-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0216223A1 true EP0216223A1 (de) | 1987-04-01 |
EP0216223B1 EP0216223B1 (de) | 1989-07-12 |
Family
ID=4264958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86112263A Expired EP0216223B1 (de) | 1985-09-06 | 1986-09-04 | Mittelteilwerkplatte für eine Uhr, Verfahren zur Herstellung dieser Mittelteilwerkplatte und eine mit einer solchen Mittelteilwerkplatte ausgerüstete Uhr |
Country Status (9)
Country | Link |
---|---|
US (1) | US4696577A (de) |
EP (1) | EP0216223B1 (de) |
JP (1) | JPS6259889A (de) |
CN (1) | CN1003744B (de) |
BR (1) | BR8604226A (de) |
CH (1) | CH662034GA3 (de) |
DE (1) | DE3664388D1 (de) |
HK (1) | HK32493A (de) |
SG (1) | SG70692G (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH675045GA3 (de) * | 1989-03-07 | 1990-08-31 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5033035A (en) * | 1989-09-27 | 1991-07-16 | Mondaine Watch Ltd. | Watertight watch |
AU4293497A (en) * | 1996-10-03 | 1998-04-24 | Comadur Sa | Watch frame comprising a case and a supporting device |
US5943302A (en) * | 1996-11-13 | 1999-08-24 | Bonneville Watches | Modular wristwatch assembly and case assembly for same |
JP2002189084A (ja) * | 2000-12-21 | 2002-07-05 | Seiko Instruments Inc | 腕時計 |
EP1237058A1 (de) * | 2001-02-28 | 2002-09-04 | Eta SA Fabriques d'Ebauches | Benutzung einer nichtmagnetischen Schicht zum Abdecken von Teilen in einem Uhrengangwerk |
JP2008032418A (ja) * | 2006-07-26 | 2008-02-14 | Seiko Instruments Inc | 時計 |
CN101329551B (zh) * | 2007-06-19 | 2011-04-13 | 马凯 | 机械手表人造宝石夹板的模板和人造宝石夹板加工方法 |
JP5003373B2 (ja) * | 2007-09-14 | 2012-08-15 | セイコーエプソン株式会社 | 時計 |
DE102009015919A1 (de) | 2009-03-25 | 2010-10-07 | Chiron-Werke Gmbh & Co Kg | Vorrichtung und Verfahren zur Herstellung zumindest eines Werkstücks |
JPWO2011074682A1 (ja) * | 2009-12-17 | 2013-05-02 | 日本電気株式会社 | 筐体、電子装置および表示パネルの収容方法 |
JP6608714B2 (ja) * | 2016-01-21 | 2019-11-20 | セイコーインスツル株式会社 | 時計 |
US20210026308A1 (en) * | 2019-07-22 | 2021-01-28 | Fossil Group, Inc. | Subtractive manufacturing of an oversized mim blank |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US360477A (en) * | 1887-04-05 | pottee | ||
CH183261A (fr) * | 1935-08-15 | 1936-03-31 | Favre Henri | Boîte de montre-bracelet. |
CH250700A (fr) * | 1945-09-11 | 1947-09-15 | Schild Sa A | Pièce d'horlogerie. |
FR1453876A (fr) * | 1965-05-13 | 1966-07-22 | Ct Tech De L Ind Horlogere | Procédé de traitement de pièces à revêtements métalliques de grande dureté età forte protection contre la corrosion et pièces à revêtements métalliques obtenues selon ce procédé |
DE1988992U (de) * | 1968-04-05 | 1968-07-04 | Staiger Feinmech | Platine fuer uhren. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH66161A (fr) * | 1913-10-15 | 1914-08-01 | Camille Robert | Boîte de montre avec cercle porte-cuvette indépendant du mouvement |
US3726082A (en) * | 1970-01-13 | 1973-04-10 | Citizen Watch Co Ltd | Watch case |
GB1350943A (en) * | 1970-07-23 | 1974-04-24 | Suwa Seikosha Kk | Timepiece case |
CH67374A4 (de) * | 1974-01-18 | 1975-09-15 | ||
JPS573069A (en) * | 1980-06-06 | 1982-01-08 | Seiko Instr & Electronics Ltd | Production of shelled watch case |
-
1985
- 1985-09-06 CH CH385785A patent/CH662034GA3/fr unknown
-
1986
- 1986-08-27 US US06/900,924 patent/US4696577A/en not_active Expired - Fee Related
- 1986-09-03 CN CN86105944.1A patent/CN1003744B/zh not_active Expired
- 1986-09-03 BR BR8604226A patent/BR8604226A/pt not_active IP Right Cessation
- 1986-09-04 EP EP86112263A patent/EP0216223B1/de not_active Expired
- 1986-09-04 DE DE8686112263T patent/DE3664388D1/de not_active Expired
- 1986-09-05 JP JP61208091A patent/JPS6259889A/ja active Granted
-
1992
- 1992-07-06 SG SG706/92A patent/SG70692G/en unknown
-
1993
- 1993-04-01 HK HK324/93A patent/HK32493A/xx unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US360477A (en) * | 1887-04-05 | pottee | ||
CH183261A (fr) * | 1935-08-15 | 1936-03-31 | Favre Henri | Boîte de montre-bracelet. |
CH250700A (fr) * | 1945-09-11 | 1947-09-15 | Schild Sa A | Pièce d'horlogerie. |
FR1453876A (fr) * | 1965-05-13 | 1966-07-22 | Ct Tech De L Ind Horlogere | Procédé de traitement de pièces à revêtements métalliques de grande dureté età forte protection contre la corrosion et pièces à revêtements métalliques obtenues selon ce procédé |
DE1988992U (de) * | 1968-04-05 | 1968-07-04 | Staiger Feinmech | Platine fuer uhren. |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH675045GA3 (de) * | 1989-03-07 | 1990-08-31 | ||
EP0386621A1 (de) * | 1989-03-07 | 1990-09-12 | Eta SA Fabriques d'Ebauches | Uhr mit einer durch zwei Längsträger getragenen Werkplatten- und Mittelteil-Einheit |
Also Published As
Publication number | Publication date |
---|---|
CN86105944A (zh) | 1987-05-13 |
BR8604226A (pt) | 1987-04-28 |
CH662034GA3 (de) | 1987-09-15 |
JPH0457236B2 (de) | 1992-09-10 |
SG70692G (en) | 1992-09-04 |
DE3664388D1 (en) | 1989-08-17 |
EP0216223B1 (de) | 1989-07-12 |
JPS6259889A (ja) | 1987-03-16 |
HK32493A (en) | 1993-04-08 |
CN1003744B (zh) | 1989-03-29 |
US4696577A (en) | 1987-09-29 |
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