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公开(公告)号：US3486645A
公开(公告)日：1969-12-30
申请号：US3486645D
申请日：1966-11-23
Applicant: CLEVELAND F HEARN
Inventor： HEARN CLEVELAND F
CPC classification number: B60P1/6427 , B60P1/5428 , B60P1/64
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