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公开(公告)号：US3160831A
公开(公告)日：1964-12-08
申请号：US22807362
申请日：1962-10-03
Applicant: BELL TELEPHONE LABOR INC
Inventor： MERRILL FRANCIS G , SNYDER PAUL J
IPC: H03H7/38
CPC classification number: H03H7/38
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