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发明名称
Plug valve
摘要
申请公布号
US2028181(A)
申请公布日期
1936.01.21
申请号
US19310560296
申请日期
1931.08.29
申请人
WALWORTH PATENTS, INC.
发明人
BARD FRANCIS N.
分类号
F16K31/53
主分类号
F16K31/53
代理机构
代理人
主权项
地址
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