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经营范围
发明名称
Four engine compounding arrangement for drive shaft of a rotary drilling rig and two mud pumps
摘要
申请公布号
US2707618(A)
申请公布日期
1955.05.03
申请号
US19520270134
申请日期
1952.02.06
申请人
THE BREWSTER COMPANY
发明人
BROWN WALTER
分类号
E21B3/02
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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