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公开(公告)号：US2824488A
公开(公告)日：1958-02-25
申请号：US45201654
申请日：1954-08-25
Applicant: NAT RES CORP
Inventor： BRIDGES SAMUEL W , ROEHRIG JONATHAN R
CPC classification number: G01N21/21 , G01N33/362
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