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公开(公告)号：US2918820A
公开(公告)日：1959-12-29
申请号：US60257456
申请日：1956-08-07
Applicant: DAYSTROM INC
Inventor： BARTON WEBLEY E
CPC classification number: G01K5/68 , H01H37/56 , Y10T428/125
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