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发明名称
Power unit
摘要
申请公布号
US1825087(A)
申请公布日期
1931.09.29
申请号
US19260126726
申请日期
1926.08.02
申请人
PARK LINN K
发明人
PARK LINN K.
分类号
E21B3/02;E21B19/00
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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