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公开(公告)号：US2449365A
公开(公告)日：1948-09-14
申请号：US63498945
申请日：1945-12-14
Applicant: HYDRAULIC DEV CORP INC
Inventor： BOBER WALTER F , SEBRING FRANK E
IPC: B21J9/02
CPC classification number: B21J9/02 , Y10T29/5127
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