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公开(公告)号：US2818748A
公开(公告)日：1958-01-07
申请号：US30781452
申请日：1952-09-04
Applicant: MELPAR INC
Inventor： ARNOLD LAWSON AXEL , ROSS CHESTER W
IPC: G05G7/02
CPC classification number: G05G7/02 , G05G2700/16 , Y10T74/20762
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