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公开(公告)号：US2815776A
公开(公告)日：1957-12-10
申请号：US47664254
申请日：1954-12-21
Applicant: IMPROVED MACHINERY INC
Inventor： ANNIS JR RUPERT E , PHILBROOK DOUGLAS A
IPC: B27L1/04
CPC classification number: B27L1/045
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