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公开(公告)号：US2771251A
公开(公告)日：1956-11-20
申请号：US42279454
申请日：1954-04-13
Applicant: MORRIS SILVERSTEIN
Inventor： MORRIS SILVERSTEIN
CPC classification number: D06H3/04 , B65H16/06 , B65H75/08 , B65H2407/22 , B65H2701/174 , Y10T279/1961
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