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公开(公告)号：US3490841A
公开(公告)日：1970-01-20
申请号：US3490841D
申请日：1968-01-15
Applicant: IBM
Inventor： CELY JAMES V JR , RITCHIE ROBERT T
IPC: G03G15/00
CPC classification number: G03G15/751
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