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经营范围
发明名称
Sealing ring coupling
摘要
申请公布号
US3216746(A)
申请公布日期
1965.11.09
申请号
US19620186586
申请日期
1962.03.29
申请人
GRAY TOOL COMPANY
发明人
WATTS JOHN D.
分类号
E21B17/04;E21B17/08;E21B33/00;E21B33/04;F16L23/08
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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