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公开(公告)号：US1938995A
公开(公告)日：1933-12-12
申请号：US55767131
申请日：1931-08-17
Applicant: BEYNON ROSS E
Inventor： BEYNON ROSS E
IPC: B21B27/03
CPC classification number: B21B27/03 , Y10T29/49865
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