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公开(公告)号：US3331690A
公开(公告)日：1967-07-18
申请号：US37354964
申请日：1964-06-08
Applicant: IBM
Inventor： POPE GEORGE W , CLARKE FRANCIS R , JURCH JR GEORGE R
IPC: G03C1/54
CPC classification number: G03C1/54
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