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公开(公告)号：US1216733A
公开(公告)日：1917-02-20
申请号：US2740115
申请日：1915-05-11
Applicant: AMERICAN WELDING COMPANY
Inventor： ROWLAND CHARLES L
CPC classification number: H01L2924/14
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公开(公告)号：US1763867A
公开(公告)日：1930-06-17
申请号：US8413426
申请日：1926-01-27
Applicant: AMERICAN WELDING COMPANY
Inventor： ROWLAND CHARLES L
IPC: B21C37/29
CPC classification number: B21C37/29
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公开(公告)号：US1217221A
公开(公告)日：1917-02-27
申请号：US1914839440
申请日：1914-05-18
Applicant: AMERICAN WELDING COMPANY
Inventor： ROWLAND CHARLES L
CPC classification number: B23K5/06
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