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经营范围
发明名称
TWO RELAY LINE CIRCUIT
摘要
申请公布号
US3529098(A)
申请公布日期
1970.09.15
申请号
USD3529098
申请日期
1967.05.19
申请人
INTERN. TELEPHONE & TELEGRAPH CORP.
发明人
STEPHEN H. CHAPMAN
分类号
H04Q3/00;(IPC1-7):H04Q1/30
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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