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公开(公告)号：US1767220A
公开(公告)日：1930-06-24
申请号：US32649428
申请日：1928-12-17
Applicant: MALM ROYAL D
Inventor： MALM ROYAL D
IPC: B23K11/14
CPC classification number: B23K11/14 , B23K2201/06 , Y10T428/12271 , Y10T428/1241
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