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公开(公告)号：US2709034A
公开(公告)日：1955-05-24
申请号：US33960953
申请日：1953-03-02
Applicant: NAT RES CORP
Inventor： LAWRANCE RICHARD B , YEATON RAYMOND A
IPC: F04F9/00
CPC classification number: F04F9/00
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