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公开(公告)号：US1343434A
公开(公告)日：1920-06-15
申请号：US33131819
申请日：1919-10-17
Applicant: DAVID COOK
Inventor： DAVID COOK
IPC: B66C21/00
CPC classification number: B66C21/00 , B66C2700/011
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