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公开(公告)号：US1121757A
公开(公告)日：1914-12-22
申请号：US1912734607
申请日：1912-12-02
Applicant: ROBERT D PEARSON
Inventor： PEARSON IDA M
CPC classification number: B60B21/12 , B60C17/06 , Y10T152/10756
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