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公开(公告)号：US2880073A
公开(公告)日：1959-03-31
申请号：US50115155
申请日：1955-04-13
Applicant: PHILLIPS PETROLEUM CO
Inventor： LUPFER DALE E , HOUSER EDWIN A
IPC: G01N21/75
CPC classification number: G01N21/75 , Y10T436/117497
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