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公开(公告)号：US2191624A
公开(公告)日：1940-02-27
申请号：US24353238
申请日：1938-12-02
Applicant: BELL TELEPHONE LABOR INC
Inventor： PHIPPS GEORGE S , SCHUMACHER EARLE E
IPC: B23K35/26
CPC classification number: B23K35/268
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