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公开(公告)号：US2976057A
公开(公告)日：1961-03-21
申请号：US70764458
申请日：1958-01-07
Applicant: EVANS PROD CO
Inventor： KROKOS RAYMOND M , SMITH NEWMAN B
IPC: B62H7/00
CPC classification number: B62H1/12
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