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公开(公告)号：US3205950A
公开(公告)日：1965-09-14
申请号：US30111863
申请日：1963-08-09
Applicant: NAT RES DEV
Inventor： FRANK HOWSON DAVID , HENRY MARSDEN ROBERT , JOEL HAMBLIN HENRY
CPC classification number: A01B35/14 , A01B51/026 , A01B59/048 , A01B61/00 , A01B63/04 , B62D49/065 , B62D49/0657
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