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公开(公告)号：US2410260A
公开(公告)日：1946-10-29
申请号：US55075944
申请日：1944-08-23
Applicant: POOR & CO
Inventor： BOLAND EDWARD J
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/08 , E01B2201/10
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