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1.发明专利
公开(公告)号：CA992599A
公开(公告)日：1976-07-06
申请号：CA126621
申请日：1971-11-02
Applicant: IBM
Inventor： BRUCE GEORGE D , DAVIDGE RONALD V , FOWLER RAYMOND L , HOBGOOD GEORGE W JR , LOCKLAR HENRY C JR , VAN CLEAVE GEORGE W
IPC: G03B27/52
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