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公开(公告)号：US2287077A
公开(公告)日：1942-06-23
申请号：US40313541
申请日：1941-07-19
Applicant: BELL TELEPHONE LABOR INC
Inventor： ABRAHAM LEONARD G
IPC: H04B1/64
CPC classification number: H04B1/64
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公开(公告)号：US2158993A
公开(公告)日：1939-05-23
申请号：US15270137
申请日：1937-07-09
Applicant: BELL TELEPHONE LABOR INC
Inventor： ABRAHAM LEONARD G
IPC: H04B3/06
CPC classification number: H04B3/06
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