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公开(公告)号：US1922654A
公开(公告)日：1933-08-15
申请号：US52340431
申请日：1931-03-18
Applicant: BELL TELEPHONE LABOR INC
Inventor： BAIR RALPH S , BISHOP JOHN B
IPC: H03C1/20
CPC classification number: H03C1/20
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