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1.Synchronous motor controlled secondary clock synchronizing device 失效
Title translation: 同步电机控制次级时钟同步装置公开(公告)号:US2700271A
公开(公告)日:1955-01-25
申请号:US32763352
申请日:1952-12-23
Applicant: IBM
Inventor: SPRECKER ALFRED L
IPC: G04C11/00
CPC classification number: G04C11/005 , Y10T74/2107
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公开(公告)号:US2754495A
公开(公告)日:1956-07-10
申请号:US34776253
申请日:1953-04-09
Applicant: IBM
Inventor: SPRECKER ALFRED L , HENRY WILLIAM F
CPC classification number: G04C13/03 , H02J13/0041
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公开(公告)号:US2379836A
公开(公告)日:1945-07-03
申请号:US47934543
申请日:1943-03-16
Applicant: IBM
Inventor: SPRECKER ALFRED L
IPC: G04C13/04
CPC classification number: G04C13/0454
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公开(公告)号:US2101421A
公开(公告)日:1937-12-07
申请号:US300135
申请日:1935-01-23
Applicant: IBM
Inventor: SPRECKER ALFRED L
IPC: H04L27/26
CPC classification number: H04L27/26
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公开(公告)号:US2046005A
公开(公告)日:1936-06-30
申请号:US64318232
申请日:1932-11-18
Applicant: IBM
Inventor: SPRECKER ALFRED L
IPC: G01G23/18
CPC classification number: G01G23/18 , Y10S33/03 , Y10S177/06
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公开(公告)号:US2016687A
公开(公告)日:1935-10-08
申请号:US64912332
申请日:1932-12-28
Applicant: IBM
Inventor: SPRECKER ALFRED L
IPC: E05B35/08
CPC classification number: E05B35/08 , Y10T70/713 , Y10T70/7446
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公开(公告)号:US1987272A
公开(公告)日:1935-01-08
申请号:US69206433
申请日:1933-10-04
Applicant: IBM
Inventor: SPRECKER ALFRED L
IPC: B66B25/00
CPC classification number: B66B25/00
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公开(公告)号:US2348158A
公开(公告)日:1944-05-02
申请号:US41481741
申请日:1941-10-13
Applicant: IBM
Inventor: SPRECKER ALFRED L
IPC: G08B9/04
CPC classification number: G08B9/04
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公开(公告)号:US2059757A
公开(公告)日:1936-11-03
申请号:US70336333
申请日:1933-12-21
Applicant: IBM
Inventor: SPRECKER ALFRED L
IPC: G08B13/08
CPC classification number: G08B13/08
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