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公开(公告)号：US2012773A
公开(公告)日：1935-08-27
申请号：US67373933
申请日：1933-05-31
Applicant: JOSEPH ROCKMAN
Inventor： JOSEPH ROCKMAN
CPC classification number: B60C23/001 , B60B39/12 , Y10T137/7472 , Y10T152/10279
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