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经营范围
发明名称
Roller bit structure
摘要
申请公布号
US2116561(A)
申请公布日期
1938.05.10
申请号
US19350011650
申请日期
1935.03.18
申请人
EDWIN A. PERKINS;FRANK W. BRAINARD
发明人
CRUM ROLAND R.
分类号
E21B10/10
主分类号
E21B10/10
代理机构
代理人
主权项
地址
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