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公开(公告)号:US2264886A
公开(公告)日:1941-12-02
申请号:US26908739
申请日:1939-04-21
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
IPC: G11B17/00
CPC classification number: G11B17/00
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公开(公告)号:US2284836A
公开(公告)日:1942-06-02
申请号:US7566036
申请日:1936-04-22
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D , RENHOLDT JOHN E
IPC: G11B25/02
CPC classification number: G11B25/02
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公开(公告)号:US2142407A
公开(公告)日:1939-01-03
申请号:US15229937
申请日:1937-07-07
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D , RENHOLDT JOHN E
IPC: G10K11/22
CPC classification number: G10K11/22
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公开(公告)号:US2578924A
公开(公告)日:1951-12-18
申请号:US4928248
申请日:1948-09-14
Applicant: DICTAPHONE CORP
Inventor: CURTIS ROGER C , NORTON LELAND D
IPC: H04M1/215
CPC classification number: H04M1/215 , Y10S336/02
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公开(公告)号:US2500561A
公开(公告)日:1950-03-14
申请号:US5200548
申请日:1948-09-30
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
IPC: H04R1/16
CPC classification number: H04R1/16 , Y10T24/314
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公开(公告)号:US2238863A
公开(公告)日:1941-04-15
申请号:US26322939
申请日:1939-03-21
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
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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:US2180091A
公开(公告)日:1939-11-14
申请号:US20541438
申请日:1938-05-02
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D , HORWATH JOHN H
IPC: G11B25/02
CPC classification number: G11B25/02 , Y10S428/908 , Y10T428/24339
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公开(公告)号:US2061475A
公开(公告)日:1936-11-17
申请号:US1643735
申请日:1935-04-15
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
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公开(公告)号:US2279796A
公开(公告)日:1942-04-14
申请号:US38161041
申请日:1941-03-04
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D , LUCARELLE JOSEPH M
IPC: G10K13/00
CPC classification number: G10K13/00 , Y10T74/20468
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