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发明名称
DIRECT KEYBOARD TRANSMITTER
摘要
申请公布号
CA444670(A)
申请公布日期
1947.10.21
申请号
CAD444670
申请日期
申请人
RADIO CORPORATION OF AMERICA
发明人
JAMES A. SPENCER
分类号
主分类号
代理机构
代理人
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