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公开(公告)号：US2916917A
公开(公告)日：1959-12-15
申请号：US56647056
申请日：1956-02-20
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： LACKEY ROBERT S , GLOVER CLARENCE C
IPC: G01C21/18
CPC classification number: G01C21/18 , Y10T74/1229
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