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发明名称
Automatic feed for rotary well drills
摘要
申请公布号
US2298222(A)
申请公布日期
1942.10.06
申请号
US19400322795
申请日期
1940.03.07
申请人
WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY
发明人
MCSHANE PHELAN
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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