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发明名称
Valve and valve assembly
摘要
申请公布号
US2061480(A)
申请公布日期
1936.11.17
申请号
US19300500359
申请日期
1930.12.05
申请人
GULF RESEARCH & DEVELOPMENT COMPANY
发明人
PIGOTT REGINALD J. S.
分类号
E21B34/06;F16K15/06
主分类号
E21B34/06
代理机构
代理人
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