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公开(公告)号：US1382848A
公开(公告)日：1921-06-28
申请号：US42049220
申请日：1920-10-29
Applicant: ANDERSON OOLEY
Inventor： ANDERSON OOLEY
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/10
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