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发明名称
Selecting system
摘要
申请公布号
US1952368(A)
申请公布日期
1934.03.27
申请号
US19270211101
申请日期
1927.08.06
申请人
GARDNER JOHN E
发明人
GARDNER JOHN E.
分类号
H04Q9/06
主分类号
H04Q9/06
代理机构
代理人
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地址
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