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公开(公告)号：US3238648A
公开(公告)日：1966-03-08
申请号：US33238863
申请日：1963-12-23
Applicant: CATERPILLAR TRACTOR CO
Inventor： COBB DELWIN E , HEINOLD LLOYD K
CPC classification number: E02F3/7618 , E02F3/80 , E02F3/8152 , E02F3/8155
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