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发明名称
Rotary swivel
摘要
申请公布号
US2394800(A)
申请公布日期
1946.02.12
申请号
US19410396308
申请日期
1941.06.02
申请人
THE NATIONAL SUPPLY COMPANY
发明人
MURPHY DEMERY A.
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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