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公开(公告)号：US1974832A
公开(公告)日：1934-09-25
申请号：US52738431
申请日：1931-04-03
Applicant: JAMES G BENNETT
Inventor： PETERSON HJALMAR M
IPC: B63B22/16
CPC classification number: B63B22/166 , B63B2201/08
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