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公开(公告)号:US2232719A
公开(公告)日:1941-02-25
申请号:US31036839
申请日:1939-12-21
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D , PETRUSCHELL LUCIUS P
IPC: G11B25/00
CPC classification number: G11B25/00
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公开(公告)号:US2456592A
公开(公告)日:1948-12-14
申请号:US70068946
申请日:1946-10-02
Applicant: DICTAPHONE CORP
Inventor: PETRUSCHELL LUCIUS P
IPC: G11B25/02
CPC classification number: G11B25/02
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公开(公告)号:US2284678A
公开(公告)日:1942-06-02
申请号:US34876840
申请日:1940-07-31
Applicant: DICTAPHONE CORP
Inventor: PETRUSCHELL LUCIUS P
IPC: G11B25/02
CPC classification number: G11B25/02
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公开(公告)号:US2656140A
公开(公告)日:1953-10-20
申请号:US510648
申请日:1948-01-29
Applicant: DICTAPHONE CORP
Inventor: PETRUSCHELL LUCIUS P
IPC: G11B25/00
CPC classification number: G11B25/00
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公开(公告)号:US2441840A
公开(公告)日:1948-05-18
申请号:US55556344
申请日:1944-09-23
Applicant: DICTAPHONE CORP
Inventor: PETRUSCHELL LUCIUS P
CPC classification number: H04M1/6515 , H03G3/22 , H04M1/215
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