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经营范围
发明名称
Vacuum pump
摘要
申请公布号
US2337849(A)
申请公布日期
1943.12.28
申请号
US19390261803
申请日期
1939.03.14
申请人
W. M. WELCH MANUFACTURING COMPANY
发明人
DUBROVIN JOHN
分类号
F04C18/344;F04C27/02
主分类号
F04C18/344
代理机构
代理人
主权项
地址
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