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发明名称
CORE-DRILLING TOOL
摘要
申请公布号
SU1500757(A1)
申请公布日期
1989.08.15
申请号
SU19874290912
申请日期
1987.07.28
申请人
DO POLT INSTITUT
发明人
RAVILOV ISMAIL V,SU;CHALENKO ALEKSANDR A,SU;RUDKOVSKIJ ALEKSANDR N,SU
分类号
E21B21/00;E21B25/00
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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