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公开(公告)号：US3139750A
公开(公告)日：1964-07-07
申请号：US13374661
申请日：1961-08-24
Applicant: SMITH MAX R , HOWELL MELVIN D
Inventor： SMITH MAX R , HOWELL MELVIN D
IPC: G01L1/08
CPC classification number: G01L1/083
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