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发明名称
METAL-TO-METAL FACE SEAL FOR ROCK BITS
摘要
申请公布号
EP0335497(A3)
申请公布日期
1989.12.27
申请号
EP19890301829
申请日期
1989.02.24
申请人
SMITH INTERNATIONAL, INC.
发明人
CHIA, WENG-KWEN RAYMOND;ANDERSON, GEORGE FRANKLIN
分类号
E21B10/22;E21B10/25;F16J15/34;(IPC1-7):E21B10/22
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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