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公开(公告)号：US2781074A
公开(公告)日：1957-02-12
申请号：US40285554
申请日：1954-01-08
Applicant: HARRY HOWARD
Inventor： HARRY HOWARD
IPC: B60C19/00
CPC classification number: B60C19/00 , Y10T152/10243
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