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发明名称
Drilling apparatus
摘要
申请公布号
US2250670(A)
申请公布日期
1941.07.29
申请号
US19390251929
申请日期
1939.01.20
申请人
JOY MANUFACTURING COMPANY
发明人
JOY JOSEPH F.
分类号
A62C31/22;E21B3/02;E21B7/00;E21B10/44
主分类号
A62C31/22
代理机构
代理人
主权项
地址
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