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发明名称
Free wheeling wash-over spear mechanism
摘要
申请公布号
US3003561(A)
申请公布日期
1961.10.10
申请号
US19570697861
申请日期
1957.11.21
申请人
WASH OVERSHOT AND SPEAR ENGINEERS, INCORPORATED
发明人
SR. FRANKLIN L. LE BUS,;WARE CECIL
分类号
E21B31/00
主分类号
E21B31/00
代理机构
代理人
主权项
地址
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