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公开(公告)号:US2275309A
公开(公告)日:1942-03-03
申请号:US35056840
申请日:1940-08-03
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
IPC: H04R11/08
CPC classification number: H04R11/08
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公开(公告)号:US2181437A
公开(公告)日:1939-11-28
申请号:US19480738
申请日:1938-03-09
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
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公开(公告)号:US2132830A
公开(公告)日:1938-10-11
申请号:US75384534
申请日:1934-11-20
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
IPC: H03G7/02
CPC classification number: H03G7/02
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公开(公告)号:US2051792A
公开(公告)日:1936-08-18
申请号:US905835
申请日:1935-03-02
Applicant: DICTAPHONE CORP
Inventor: BEARD THEODORE H , NORTON LELAND D , RENHOLDT JOHN E
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公开(公告)号:US2043769A
公开(公告)日:1936-06-09
申请号:US59254832
申请日:1932-02-12
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
IPC: G11B3/00
CPC classification number: G11B3/00 , Y10S428/908 , Y10T442/162 , Y10T442/176
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公开(公告)号:US2014581A
公开(公告)日:1935-09-17
申请号:US64587832
申请日:1932-12-06
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
IPC: G11B25/02
CPC classification number: G11B25/02
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公开(公告)号:US2425486A
公开(公告)日:1947-08-12
申请号:US58910945
申请日:1945-04-19
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
IPC: G11B25/02
CPC classification number: G11B25/02
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公开(公告)号:US2152440A
公开(公告)日:1939-03-28
申请号:US4357635
申请日:1935-10-04
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D , FRYKMAN VICTOR L
IPC: H04R11/08
CPC classification number: H04R11/08
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公开(公告)号:US2143819A
公开(公告)日:1939-01-10
申请号:US10396036
申请日:1936-10-05
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
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公开(公告)号:US2110092A
公开(公告)日:1938-03-01
申请号:US9065436
申请日:1936-07-15
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D , FRYKMAN VICTOR L
IPC: H04R11/08
CPC classification number: H04R11/08
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