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1.发明授权
公开(公告)号：US3222667A
公开(公告)日：1965-12-07
申请号：US18991462
申请日：1962-04-24
Applicant: NAT RES DEV
Inventor： ALEXANDER WORONCOW , RANDALL JACK S , RALPH BENJAMIN
IPC: G09G1/10
CPC classification number: G09G1/10
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