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公开(公告)号：US2220305A
公开(公告)日：1940-11-05
申请号：US32228740
申请日：1940-03-05
Applicant: TURNEY EUGENE T
Inventor： TURNEY EUGENE T
IPC: H04R1/28
CPC classification number: H04R1/2811 , H04R1/2888
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公开(公告)号：US1943046A
公开(公告)日：1934-01-09
申请号：US64658532
申请日：1932-12-10
Applicant: TURNEY EUGENE T
Inventor： TURNEY EUGENE T
IPC: G04C3/027
CPC classification number: G04C3/027
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公开(公告)号：US1757984A
公开(公告)日：1930-05-13
申请号：US32526328
申请日：1928-12-11
Applicant: TURNEY EUGENE T
Inventor： TURNEY EUGENE T
IPC: G03B17/34
CPC classification number: G03B17/34
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