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公开(公告)号：US2165981A
公开(公告)日：1939-07-11
申请号：US9819836
申请日：1936-08-27
Applicant: JULIAN E SAMPSON
Inventor： SAMPSON JOHN C
CPC classification number: H04R23/004 , H01J21/08 , H04R23/00
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公开(公告)号：US1797620A
公开(公告)日：1931-03-24
申请号：US30440728
申请日：1928-09-07
Applicant: JULIAN E SAMPSON
Inventor： SAMPSON JOHN C
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