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公开(公告)号：US2104546A
公开(公告)日：1938-01-04
申请号：US75494634
申请日：1934-11-27
Applicant: IBM
Inventor： PENNELL LAWRENCE P , STONE WALTER F , NAYLOR WILLIAM E
IPC: B07C5/20
CPC classification number: B07C5/20
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