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公开(公告)号：US3234846A
公开(公告)日：1966-02-15
申请号：US85375659
申请日：1959-11-18
Applicant: STANDARD OIL CO
Inventor： CROPPER WENDELL P , HOFF MELVERN C , PAUL EVAN
IPC: G01N21/53
CPC classification number: G01N21/532
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