Mainspring device and a winding protection structure | Patent Publication Number 20010005339

US 20010005339 A1
Patent NumberUS 06439762 B2
Application Number9774445
Filled DateJan 31, 2001
Priority DateApr 14, 1999
Publication DateJun 28, 2001
Original AssigneeSeiko Epson Corporation
Current AssigneeSeiko Epson Corporation
Inventor/ApplicantsTatsuo Hara
Tatsuo Hara
Yoshihiko Momose
Yoshihiko Momose
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