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经营范围
发明名称
Slush nozzle for drill bits
摘要
申请公布号
US2634953(A)
申请公布日期
1953.04.14
申请号
US19480064926
申请日期
1948.12.13
申请人
REED ROLLER BIT COMPANY
发明人
STOKES JOHN C.
分类号
E21B10/60;E21B10/61;E21B10/62
主分类号
E21B10/60
代理机构
代理人
主权项
地址
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