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公开(公告)号：US2620444A
公开(公告)日：1952-12-02
申请号：US6858548
申请日：1948-12-31
Applicant: STANDARD OIL DEV CO
Inventor： HEIGL JOHN J , HINLICKY JOHN A
IPC: G01N21/31
CPC classification number: G01N21/314
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