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公开(公告)号：US3512383A
公开(公告)日：1970-05-19
申请号：US3512383D
申请日：1969-04-21
Applicant: DIGITAL MACHINES INC
Inventor： ARNOLD RAY E , ARNOLD CHARLES A
CPC classification number: B21D7/12 , G05B19/0405
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