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发明名称
Elevator
摘要
申请公布号
US2298507(A)
申请公布日期
1942.10.13
申请号
US19390298281
申请日期
1939.10.06
申请人
PENICK ARTHUR J;PENICK KIRBY T
发明人
PENICK ARTHUR J.;PENICK KIRBY T.
分类号
E21B19/07
主分类号
E21B19/07
代理机构
代理人
主权项
地址
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