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公开(公告)号：US2814952A
公开(公告)日：1957-12-03
申请号：US55004955
申请日：1955-11-30
Applicant: STANDARD OIL CO
Inventor： RYANT JR CHARLES J , NUTT RICHARD V
IPC: G01N1/24
CPC classification number: G01N1/24
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