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公开(公告)号：US3148787A
公开(公告)日：1964-09-15
申请号：US20642162
申请日：1962-06-29
Applicant: CATERPILLAR TRACTOR CO
Inventor： CLARK MURL W , MASON KARL L , ROBERTS WAYNE E
CPC classification number: E02F3/4133 , E02F3/404
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