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发明名称
BALANCED TELEPHONE INSTRUMENT CIRCUIT
摘要
申请公布号
US3597550(A)
申请公布日期
1971.08.03
申请号
USD3597550
申请日期
1968.12.26
申请人
OLAF STERNBECK
发明人
OLAF STERNBECK
分类号
H04M1/58;(IPC1-7):H04M1/58
主分类号
H04M1/58
代理机构
代理人
主权项
地址
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