(19)
(11) EP 0 273 359 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.05.1989 Bulletin 1989/19

(43) Date of publication A2:
06.07.1988 Bulletin 1988/27

(21) Application number: 87119033.6

(22) Date of filing: 22.12.1987
(51) International Patent Classification (IPC)4: G04B 37/22
(84) Designated Contracting States:
CH DE LI

(30) Priority: 29.12.1986 JP 314191/86

(71) Applicants:
  • NAMIKI PRECISION JEWEL CO., LTD.
    Adachi-ku Tokyo 123 (JP)
  • SUMITOMO ELECTRIC INDUSTRIES LIMITED
    Osaka-shi, Osaka 541 (JP)

(72) Inventors:
  • Chiba, Nobutaka
    Adachi-ku Tokyo (JP)
  • Matsumura, Hiroshi Namiki Precision Jewel Co. Ltd.
    Yuzawa-shi Akita-ken (JP)
  • Sakai, Kenichi Namiki Precision Jewel Co. Ltd.
    Yuzawa-shi Akita-ken (JP)
  • Maruyama, Masao Itami Works
    Itami-shi Hyogo-ken (JP)
  • Seki, Atsushi Itami Works
    Itami-shi Hyogo-ken (JP)
  • Minato, Yoshihiro Itami Works
    Itami-shi Hyogo-ken (JP)
  • Maeda, Yoshiki Itami Works
    Itami-shi Hyogo-ken (JP)

(74) Representative: Patentanwälte Kirschner & Grosse 
Forstenrieder Allee 59
81476 München
81476 München (DE)


(56) References cited: : 
   
       


    (54) Workpiece for a watchcase


    (57) A workpiece for a watchcase comprises a worked part (2, 4) to be machined and a base part (1, 3) joined by diffused junction with the worked part (2, 4), which is prepared by a material being superior in machinability to that for the base part (1, 3).







    Search report