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公开(公告)号：US1804461A
公开(公告)日：1931-05-12
申请号：US26102528
申请日：1928-03-12
Applicant: SMITH CORP A O
Inventor： CRAWFORD WILLIAM E , KURTZE REIMAR C F
IPC: B23K11/06
CPC classification number: B23K11/062
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