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发明名称
SELF-SEALING CORE- AND GAS-TAKING TOOL
摘要
申请公布号
SU1602968(A1)
申请公布日期
1990.10.30
申请号
SU19884486212
申请日期
1988.09.23
申请人
TREST "DALVOSTUGLERAZVEDKA"
发明人
UDOVICHENKO VIKTOR N,SU
分类号
E21B25/08
主分类号
E21B25/08
代理机构
代理人
主权项
地址
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