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发明名称
JOINT OF SPIRAL DRILLING RODS
摘要
申请公布号
PL246175(A1)
申请公布日期
1985.08.13
申请号
PL19840246175
申请日期
1984.02.10
申请人
KOPALNIA WEGLA KAMIENNEGO STAS
发明人
BOROWIK RYSZARD;LIDUCHOWSKI LEONARD;ZDEBIK JERZY
分类号
E21B;E21B17/046;(IPC1-7):E21B/
主分类号
E21B
代理机构
代理人
主权项
地址
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