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发明名称
摘要
申请公布号
FR2148229(A1)
申请公布日期
1973.03.11
申请号
FR19720028009
申请日期
1972.08.03
申请人
DOBSON PARK IND LTD
发明人
分类号
E02F9/14;E02F3/32;E21B7/02;E21B15/00;E21B19/08;E21C27/28;E21C37/24;E21D9/10;F16B7/14;(IPC1-7):E21C11/00
主分类号
E02F9/14
代理机构
代理人
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地址
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