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经营范围
发明名称
Multiple edge percussion bit
摘要
申请公布号
US2507222(A)
申请公布日期
1950.05.09
申请号
US19460691513
申请日期
1946.08.19
申请人
ORVILLE PHIPPS
发明人
PHIPPS ORVILLE
分类号
E21B10/38;E21B10/58
主分类号
E21B10/38
代理机构
代理人
主权项
地址
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