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公开(公告)号：US2909148A
公开(公告)日：1959-10-20
申请号：US60973656
申请日：1956-09-13
Applicant: NAT RES CORP
Inventor： PATTON PAUL W , KELLY ROBERT H , MACNEIL JAMES P
CPC classification number: C23C14/243 , C23C14/24 , C23C14/541
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