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1.Amplification and rectification means for use in a photographic exposure timer 失效
Title translation: 用于照相曝光定时器的放大和整流装置公开(公告)号:US3028561A
公开(公告)日:1962-04-03
申请号:US70023557
申请日:1957-12-02
Applicant: W M WELCH MFG COMPANY
Inventor: BATINA JEROME R , GROSSE KENNETH E
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公开(公告)号:US2885563A
公开(公告)日:1959-05-05
申请号:US46045454
申请日:1954-10-05
Applicant: W M WELCH MFG COMPANY
Inventor: BATINA JEROME R , GROSSE KENNETH E
IPC: G03B27/80
CPC classification number: G03B27/80
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公开(公告)号:US2715993A
公开(公告)日:1955-08-23
申请号:US29221352
申请日:1952-06-06
Applicant: W M WELCH MFG COMPANY
Inventor: BATINA JEROME R
IPC: H01J41/18
CPC classification number: H01J41/18
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