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公开(公告)号：US3486840A
公开(公告)日：1969-12-30
申请号：US3486840D
申请日：1968-05-28
Applicant: NAT RES DEV
Inventor： BURTON HAROLD , PAVEY JOHN ANTHONY , JAYNE-WILLIAMS DEREK JAMES , HANSEN WILLIAM FREDERICK
CPC classification number: A61L2/07 , B67C3/24 , B67C3/2614 , B67C7/0073 , B67C2003/2691 , Y10T137/8803
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