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发明名称
Rotary swivel
摘要
申请公布号
US2459472(A)
申请公布日期
1949.01.18
申请号
US19450584372
申请日期
1945.03.23
申请人
EMSCO DERRICK & EQUIPMENT COMPANY
发明人
TREMOLADA GUGLIELMO R.
分类号
E21B21/02
主分类号
E21B21/02
代理机构
代理人
主权项
地址
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