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经营范围
发明名称
Valve operator
摘要
申请公布号
US2620673(A)
申请公布日期
1952.12.09
申请号
US19450612488
申请日期
1945.08.24
申请人
KOPPERS COMPANY, INC.
发明人
WHITCOMB ARTHUR J.
分类号
C21B9/12
主分类号
C21B9/12
代理机构
代理人
主权项
地址
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