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公开(公告)号：US1572127A
公开(公告)日：1926-02-09
申请号：US5425825
申请日：1925-09-03
Applicant: M A WARD
Inventor： BREWER JOHN W
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/08
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