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公开(公告)号：US1777991A
公开(公告)日：1930-10-07
申请号：US33786329
申请日：1929-02-06
Applicant: LOOP MOORE GEORGE , ROBERT STEELE JAMES
Inventor： LOOP MOORE GEORGE , ROBERT STEELE JAMES
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/08
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