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公开(公告)号：US2381160A
公开(公告)日：1945-08-07
申请号：US36687740
申请日：1940-11-23
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： HANNA CLINTON R
IPC: G01C21/18
CPC classification number: G01C21/18 , Y10T74/1221 , Y10T74/1261
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