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发明名称
TELEPHONE ANTI-SIDETONE CIRCUIT
摘要
申请公布号
CA913819(A)
申请公布日期
1972.10.31
申请号
CAD913819
申请日期
1970.06.15
申请人
NORTHERN ELECTRIC COMPANY LIMITED
发明人
PATRICK D. VAN DER PUIJE
分类号
H04B1/58;H04M1/58
主分类号
H04B1/58
代理机构
代理人
主权项
地址
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