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公开(公告)号:US2057621A
公开(公告)日:1936-10-13
申请号:US73663934
申请日:1934-07-24
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D
IPC: H04R11/08
CPC classification number: H04R11/08
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公开(公告)号:US2026398A
公开(公告)日:1935-12-31
申请号:US60520232
申请日:1932-04-14
Applicant: DICTAPHONE CORP
Inventor: NORTON LELAND D , RENHOLDT JOHN E
CPC classification number: G11B17/00
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