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发明名称
Whip stock
摘要
申请公布号
US2111881(A)
申请公布日期
1938.03.22
申请号
US19370169696
申请日期
1937.10.18
申请人
WILLIAMS WILLIAM E
发明人
WILLIAMS WILLIAM E.
分类号
E21B7/06;E21B7/08;E21B23/01
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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