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发明名称
APPARATUS FOR DETERMINING TWIST ANGLE OF DRILL STRING
摘要
申请公布号
SU1239280(A1)
申请公布日期
1986.06.23
申请号
SU19843798551
申请日期
1984.10.09
申请人
VNI GEOLOGO-RAZVEDOCHNYJ NEFTYANOJ INSTITUT
发明人
VASHCHENKO VLADIMIR A,SU
分类号
E21B45/00
主分类号
E21B45/00
代理机构
代理人
主权项
地址
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