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发明名称
Signaling system
摘要
申请公布号
US2021649(A)
申请公布日期
1935.11.19
申请号
US19320618485
申请日期
1932.06.21
申请人
DOW JENNINGS B
发明人
DOW JENNINGS B.
分类号
H04B1/16;H04B1/22
主分类号
H04B1/16
代理机构
代理人
主权项
地址
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