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公开(公告)号：US2235667A
公开(公告)日：1941-03-18
申请号：US24617438
申请日：1938-12-16
Applicant: BELL TELEPHONE LABOR INC
Inventor： BLOUNT FRANK E , CEDAR GROVE , SCHENCK ALFRED K
IPC: H03K3/55
CPC classification number: H03K3/55
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