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发明名称
System of selective signaling
摘要
申请公布号
US1811443(A)
申请公布日期
1931.06.23
申请号
US19270212872
申请日期
1927.08.15
申请人
SOMERSALO GEORGE A
发明人
SOMERSALO GEORGE A.
分类号
H04B1/16
主分类号
H04B1/16
代理机构
代理人
主权项
地址
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