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发明名称
STEP-BY-STEP TELEPHONE SYSTEM WITH RANGE EXTENSION
摘要
申请公布号
US3465104(A)
申请公布日期
1969.09.02
申请号
USD3465104
申请日期
1966.09.09
申请人
BELL TELEPHONE LAB. INC.
发明人
CHARLES W. ZEBE
分类号
H04Q3/00;(IPC1-7):H04M3/42
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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