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公开(公告)号：US1331359A
公开(公告)日：1920-02-17
申请号：US34006819
申请日：1919-11-22
Applicant: ROBERT HENRY DAVIS
Inventor： HUGHES PARROTT ARTHUR , HAROLD ROUND
CPC classification number: B64D25/00 , B60R2021/0407 , B64D2201/00
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