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发明名称
Counterbalance for well pumps
摘要
申请公布号
US1868028(A)
申请公布日期
1932.07.19
申请号
US19300429168
申请日期
1930.02.17
申请人
SKINNER ALVA L
发明人
SKINNER ALVA L.
分类号
F04B47/02
主分类号
F04B47/02
代理机构
代理人
主权项
地址
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