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公开(公告)号：US2017653A
公开(公告)日：1935-10-15
申请号：US66478433
申请日：1933-04-06
Applicant: BELL TELEPHONE LABOR INC
Inventor： CLARKE CAROLE A , ELMER LLOYD A
IPC: G03B31/02
CPC classification number: G03B31/02
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