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公开(公告)号：US1723098A
公开(公告)日：1929-08-06
申请号：US28507228
申请日：1928-06-13
Applicant: FRITZ UNGERER
Inventor： FRITZ UNGERER
IPC: B21D25/00
CPC classification number: B21D25/00 , Y10S29/046
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