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公开(公告)号：US3394749A
公开(公告)日：1968-07-30
申请号：US53554066
申请日：1966-03-18
Applicant: WILLIAM W CARSTENS
Inventor： LINDLEY WILLIAM L
CPC classification number: B60C17/04 , B60B11/10 , B60C17/041
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