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公开(公告)号：US1393508A
公开(公告)日：1921-10-11
申请号：US35413220
申请日：1920-01-26
Applicant: DAVID STOTT COOPER
Inventor： LEIGHTON CROFT CHARLES
IPC: B62H1/00
CPC classification number: B62H1/00 , B62H2700/005
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