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发明名称
Electrical signaling system
摘要
申请公布号
US1763947(A)
申请公布日期
1930.06.17
申请号
US19240755371
申请日期
1924.12.12
申请人
JOSEPH RETHENOD
发明人
RETHENOD JOSEPH
分类号
H04B1/26
主分类号
H04B1/26
代理机构
代理人
主权项
地址
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