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公开(公告)号：US2906999A
公开(公告)日：1959-09-29
申请号：US48661755
申请日：1955-02-07
Applicant: NAT RES DEV
Inventor： ARTHUR WRIGHT MICHAEL
IPC: G06F3/06
CPC classification number: G06F3/0601 , G06F2003/0691
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