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发明名称
APPARECCHIO CHE SI PORTA A CONTATTO CON PERFORAZIONE PER GRUPPO PER GRUPPO PERFORATORE DI FONDO
摘要
申请公布号
IT1160015(B)
申请公布日期
1987.03.04
申请号
IT19780029136
申请日期
1978.10.26
申请人
TECHNICAL DRILLING TOOLS INC.
发明人
BASSINGER GREY
分类号
E21B17/10;(IPC1-7):E21B/
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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