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发明名称
CORRECTING IRREGULARITIES IN/ENLARGING UNDERGROUND DUCT
摘要
申请公布号
GB8612654(D0)
申请公布日期
1986.07.02
申请号
GB19860012654
申请日期
1986.05.23
申请人
I P D SYSTEMS LTD
发明人
分类号
E21B10/32;E21B;E21B7/20;E21B7/26;E21B7/28;E21B7/30;E21B29/10;F16L55/165;F16L55/18
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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