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公开(公告)号：US2033277A
公开(公告)日：1936-03-10
申请号：US58529432
申请日：1932-01-07
Applicant: BELL TELEPHONE LABOR INC
Inventor： ELMER LLOYD A , MAC-DOUGALL HARRY W
IPC: G03B31/02
CPC classification number: G03B31/02 , Y10T74/2128
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