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发明名称
DUPLEX TELEGRAPHY FREQUENCY STABILIZING SYSTEMS
摘要
申请公布号
US3424864(A)
申请公布日期
1969.01.28
申请号
USD3424864
申请日期
1965.11.15
申请人
FERRANTI LTD.
发明人
RAYMOND ANTHONY WILLIAMS
分类号
H03L7/07;H04J3/06;(IPC1-7):H04L7/00
主分类号
H03L7/07
代理机构
代理人
主权项
地址
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