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公开(公告)号：US3450147A
公开(公告)日：1969-06-17
申请号：US3450147D
申请日：1966-11-29
Applicant: DONALD A WEBB
Inventor： WEBB DONALD A
CPC classification number: B60C23/0496 , B60C29/06 , B60C29/068 , Y10T137/3646 , Y10T137/3709
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