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公开(公告)号：US3054902A
公开(公告)日：1962-09-18
申请号：US81710459
申请日：1959-06-01
Applicant: NAT RES DEV
Inventor： CECIL TIMMS , WALKER AITCHISON THOMAS , ALFRED SAYCE LEONARD
CPC classification number: B23Q15/00 , B23Q23/00 , G05B2219/37619 , G05D3/14
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