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经营范围
发明名称
Improvements in borehole pumps
摘要
申请公布号
GB642574(A)
申请公布日期
1950.09.06
申请号
GB19480017212
申请日期
1948.06.23
申请人
HUGH DOUGLAS NELSON
发明人
分类号
F04D3/00
主分类号
F04D3/00
代理机构
代理人
主权项
地址
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