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经营范围
发明名称
Rotary swivel
摘要
申请公布号
US2676788(A)
申请公布日期
1954.04.27
申请号
US19510216148
申请日期
1951.03.17
申请人
BETHIEHEM SUPPLY COMPANY
发明人
DAVIDSON HARVEY E.;EATON JOHN F.
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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