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公开(公告)号：US2844719A
公开(公告)日：1958-07-22
申请号：US44914454
申请日：1954-08-11
Applicant: BELL TELEPHONE LABOR INC
Inventor： RIEKE JOHN W , ALLAN SLOCUM
IPC: H03D1/16
CPC classification number: H03D1/16
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