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METHOD FOR THROUGH CONNECTION CHECK IN DIGITAL DATA SYSTEMS
申请公布号:
GB1504897(A)
申请号:
GB19750032583
申请日期:
1975.08.04
申请公布日期:
1978.03.22
申请人:
ERICSSON PTY LTD L
分类号:
H04M3/24;H04Q3/60;H04Q11/04;(IPC1-7):H04L11/12
主分类号:
H04M3/24
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