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公开(公告)号：US1788023A
公开(公告)日：1931-01-06
申请号：US20681427
申请日：1927-07-19
Applicant: ELECTRO DYNAMIC COMPANY
Inventor： HANS HOCHREINER
IPC: B21D28/22
CPC classification number: B21D28/22 , Y10T83/9418 , Y10T83/9476
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