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发明名称
ROTARY BIT
摘要
申请公布号
JPS5744095(A)
申请公布日期
1982.03.12
申请号
JP19810103120
申请日期
1981.07.01
申请人
SHELL INTERN RES MAATSCHAPPIJ BV
发明人
BURUUSU HAUADO UOOKAA;ROBIIN FUEENSUTORA
分类号
E21B10/18;E21B10/60;E21B21/00;E21B27/00
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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