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发明名称
COUPLING FOR STAGE CEMENTING
摘要
申请公布号
RU1779742(C)
申请公布日期
1992.12.07
申请号
SU19904886242
申请日期
1990.11.29
申请人
VNII BUROVOJ TEKHNIKI
发明人
YAKHIN NAIL KH,SU;TSYRIN YURIJ Z,SU;VANIFATEV VLADIMIR I,SU
分类号
E21B33/14
主分类号
E21B33/14
代理机构
代理人
主权项
地址
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