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发明名称
Two-way signaling system
摘要
申请公布号
US2112515(A)
申请公布日期
1938.03.29
申请号
US19360115092
申请日期
1936.12.10
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BJORNSON BJORN G.;BRYANT NEW TON W.
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
主权项
地址
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