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公开(公告)号：US1824544A
公开(公告)日：1931-09-22
申请号：US51510731
申请日：1931-02-11
Applicant: HESS CHARLES P
Inventor： HESS CHARLES P
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/02
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