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公开(公告)号：US2119287A
公开(公告)日：1938-05-31
申请号：US10646736
申请日：1936-10-19
Applicant: JAMES PRATT ROBERT
Inventor： JAMES PRATT ROBERT
CPC classification number: B60C23/0496 , B60C23/0422 , Y10T137/3662 , Y10T137/9138
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