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公开(公告)号：US2365545A
公开(公告)日：1944-12-19
申请号：US49115043
申请日：1943-06-17
Applicant: GRAHAM FREDERICK M , MARTIN EDGAR E
Inventor： GRAHAM FREDERICK M , MARTIN EDGAR E
IPC: E01B9/08
CPC classification number: E01B9/08
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