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发明名称
Safety releasing joint for drill tubes
摘要
申请公布号
US1849339(A)
申请公布日期
1932.03.15
申请号
US19280328473
申请日期
1928.12.26
申请人
HENRY SCHWAB;C. P. SKINNER;FRED JONES
发明人
VALLENDOR MAX L.
分类号
E21B17/06
主分类号
E21B17/06
代理机构
代理人
主权项
地址
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