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公开(公告)号：US1779607A
公开(公告)日：1930-10-28
申请号：US18288127
申请日：1927-04-11
Applicant: BETHLEHEM STEEL CORP
Inventor： LEWIS ROY A , SYLVESTER JOHN M
IPC: B23K23/00
CPC classification number: B23K23/00
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