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公开(公告)号：US2240568A
公开(公告)日：1941-05-06
申请号：US28077239
申请日：1939-06-23
Applicant: IBM
Inventor： MILLS ALBERT W , FURMAN FRANK J , WALSOE SIGURD L
IPC: B41J13/00
CPC classification number: B41J13/00
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