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发明名称
PACKING-SEAL FOR BOREHOLES
摘要
申请公布号
EP0331676(B1)
申请公布日期
1992.03.18
申请号
EP19870907332
申请日期
1987.11.09
申请人
UNIVERSITY OF WATERLOO;BELSHAW, DOUGLAS JAMES
发明人
TOON, DONALD, ARTHUR;KURYLLOWICZ, PETER, FREDERICK;CHERRY, JOHN, ANTHONY;JOHNSON, PAUL, EDWIN;BELSHAW, DOUGLAS JAMES
分类号
E21B33/12;E21B33/127
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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