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公开(公告)号：US2770185A
公开(公告)日：1956-11-13
申请号：US32875852
申请日：1952-12-30
Applicant: IBM
Inventor： CROWELL ARNOLD B , REITFORT HENRY A , MANKIEWICZ CHESTER V
IPC: B41L47/24
CPC classification number: B41L47/24
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