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公开(公告)号：US1721905A
公开(公告)日：1929-07-23
申请号：US13436126
申请日：1926-09-09
Applicant: BLACK ROCK MFG COMPANY
Inventor： HAMMOND GUY L , MESSINGER JR LESTER HUBERT
IPC: B26D3/16
CPC classification number: B26D3/162 , Y10T82/16591 , Y10T82/16771 , Y10T82/16951
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