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公开(公告)号：US2939313A
公开(公告)日：1960-06-07
申请号：US68849157
申请日：1957-10-07
Applicant: STANDARD OIL CO
Inventor： CROPPER WENDELL P , DE BOER FRANK E
IPC: G01N25/52
CPC classification number: G01N25/52
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