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发明名称
DIRECT CURRENT REDUCTION NETWORK FOR AMPLIFICATION TELEPHONE SETS
摘要
申请公布号
US3627952(A)
申请公布日期
1971.12.14
申请号
USD3627952
申请日期
1970.03.09
申请人
JEAN-MICHEL PERSON
发明人
JEAN-MICHEL PERSON
分类号
H04B3/44;H04M19/00;(IPC1-7):H04M1/76
主分类号
H04B3/44
代理机构
代理人
主权项
地址
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