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发明名称
Differential and straight brake equalizer for rotary draw works
摘要
申请公布号
US1760180(A)
申请公布日期
1930.05.27
申请号
US19260121811
申请日期
1926.07.12
申请人
THE NATIONAL SUPPLY COMPANY
发明人
SPALDING JOHN D.;FAULKNER DAVID S.
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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