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公开(公告)号：US1930275A
公开(公告)日：1933-10-10
申请号：US61239232
申请日：1932-05-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： KNOWLTON ALFRED D , GILMORE ALFRED C
IPC: H04M5/02
CPC classification number: H04M5/02
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