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公开(公告)号：US2585139A
公开(公告)日：1952-02-12
申请号：US18944450
申请日：1950-10-10
Applicant: NAT RES CORP
Inventor： LAWRANCE RICHARD B , MIDDLETON JR JOHN L
IPC: F04F9/00
CPC classification number: F04F9/00
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