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公开(公告)号：US2459846A
公开(公告)日：1949-01-25
申请号：US48845743
申请日：1943-05-25
Applicant: INT STANDARD ELECTRIC CORP
Inventor： NORMAN SMYTH CHARLES , SCOTT GRANT ALAN
IPC: G05F1/52
CPC classification number: G05F1/52
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