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发明名称
Elevator control
摘要
申请公布号
US1743627(A)
申请公布日期
1930.01.14
申请号
US19270198854
申请日期
1927.06.14
申请人
SHEPARD OSCAR F
发明人
SHEPARD OSCAR F.
分类号
H02P7/34
主分类号
H02P7/34
代理机构
代理人
主权项
地址
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