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公开(公告)号：US2283996A
公开(公告)日：1942-05-26
申请号：US33730840
申请日：1940-05-25
Applicant: JAMES IRWIN SAMUEL , IRWIN KENNETH M
Inventor： JAMES IRWIN SAMUEL , IRWIN KENNETH M
IPC: B23K9/28
CPC classification number: B23K9/282
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