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公开(公告)号：US1466104A
公开(公告)日：1923-08-28
申请号：US36779920
申请日：1920-03-22
Applicant: SMITH CORP A O
Inventor： STANLEY SMITH REUBEN , HENRY MILLER , FREDERICK ORTON
IPC: B21D11/18
CPC classification number: B21D11/18
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