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公开(公告)号：US1353206A
公开(公告)日：1920-09-21
申请号：US35933820
申请日：1920-02-17
Applicant: HUBERT YATES
Inventor： HUBERT YATES
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/02
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