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发明名称
Two-way signaling system
摘要
申请公布号
US2060008(A)
申请公布日期
1936.11.10
申请号
US19340740518
申请日期
1934.08.18
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
ABRAHAM LEONARD GLADSTONE
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
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