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公开(公告)号：US2759175A
公开(公告)日：1956-08-14
申请号：US41598254
申请日：1954-03-12
Applicant: SPALDING THOMAS R
Inventor： SPALDING THOMAS R
CPC classification number: G01M3/045 , F16L2201/30 , G01M3/183
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