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经营范围
发明名称
Differential resistance valve
摘要
申请公布号
US1994974(A)
申请公布日期
1935.03.19
申请号
US19300462787
申请日期
1930.06.21
申请人
THE OILGEAR COMPANY
发明人
WIEDMANN ERNST
分类号
F16K17/168
主分类号
F16K17/168
代理机构
代理人
主权项
地址
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