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公开(公告)号：US2721025A
公开(公告)日：1955-10-18
申请号：US39540253
申请日：1953-12-01
Applicant: NAT RES CORP
Inventor： LAWRANCE RICHARD B , SOFER GEORGE A
IPC: F04F9/00
CPC classification number: F04F9/00
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