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发明名称
Drill pipe protector
摘要
申请公布号
US3148004(A)
申请公布日期
1964.09.08
申请号
US19620214030
申请日期
1962.08.01
申请人
WEATHERFORD OIL TOOL COMPANY, INC.
发明人
HALL ELMER D.;JR. JESSE E. HALL,
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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