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发明名称
Elevator
摘要
申请公布号
US1834429(A)
申请公布日期
1931.12.01
申请号
US19300469114
申请日期
1930.07.19
申请人
BYRON JACKSON CO.
发明人
SMITH NELSON K.
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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