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公开(公告)号：US2612041A
公开(公告)日：1952-09-30
申请号：US75169747
申请日：1947-06-02
Applicant: HUNTER SPRING COMPANY
Inventor： GOODFRIEND WILLIAM J
IPC: G01N3/00
CPC classification number: G01N3/00 , G01N2203/0292
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