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公开(公告)号：US3540180A
公开(公告)日：1970-11-17
申请号：US3540180D
申请日：1968-06-19
Applicant: IBM
Inventor： DEUELL ROBERT A , MAY GUENTHER W , OLDAKER ALFRED E , RAJAC THOMAS J , SAGE CLAUDE O
CPC classification number: B65G1/133
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