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发明名称
SILICON CARBIDE SEAL FOR AN EARTH BORING BIT
摘要
申请公布号
US3604523(A)
申请公布日期
1971.09.14
申请号
USD3604523
申请日期
1970.06.01
申请人
DRESSER INDUSTRIES INC.
发明人
CARL L. LICHTE
分类号
E21B10/22;E21B10/25;(IPC1-7):E21B9/08;F16C19/00
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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