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公开(公告)号：US3420517A
公开(公告)日：1969-01-07
申请号：US3420517D
申请日：1966-01-06
Applicant: NORFIN
Inventor： SNELLMAN DONALD L , KEELER JACK DANIEL
CPC classification number: B65H39/11 , Y10T74/18528
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