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发明名称
Pump jack
摘要
申请公布号
US2308823(A)
申请公布日期
1943.01.19
申请号
US19410419383
申请日期
1941.11.17
申请人
H. C. SMITH OIL TOOL CO.
发明人
PHIPPS JOHN T.
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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