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发明名称
Metal drilling-rig structure
摘要
申请公布号
US1800882(A)
申请公布日期
1931.04.14
申请号
US19270194800
申请日期
1927.05.27
申请人
BLOSS RICHARD R
发明人
BLOSS RICHARD R.
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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