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经营范围
发明名称
JUNK BOOT
摘要
申请公布号
US4111262(A)
申请公布日期
1978.09.05
申请号
US19770829603
申请日期
1977.09.01
申请人
SMITH INTERNATIONAL, INC.
发明人
DUNCAN, GRANT
分类号
E21B27/00;E21B31/08;(IPC1-7):E21B31/08
主分类号
E21B27/00
代理机构
代理人
主权项
地址
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