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发明名称
Improvements in and relating to free pistons for use in eduction pipes of apparatus for raising liquid in wells
摘要
申请公布号
GB635772(A)
申请公布日期
1950.04.19
申请号
GB19470004145
申请日期
1947.02.13
申请人
NORMAN FRASER BROWN
发明人
分类号
F04B47/12
主分类号
F04B47/12
代理机构
代理人
主权项
地址
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