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公开(公告)号：US2920900A
公开(公告)日：1960-01-12
申请号：US57706856
申请日：1956-04-09
Applicant: CAL DAK COMPANY
Inventor： BEST MELVIN H
CPC classification number: B62B3/027 , B62B1/12 , B62B2202/26
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