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公开(公告)号：US1921589A
公开(公告)日：1933-08-08
申请号：US26057728
申请日：1928-03-10
Applicant: C H BICKELL
Inventor： SPARKS STANLEY W
IPC: B21K1/24
CPC classification number: B21K1/24 , Y10S29/043 , Y10T29/49426
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