DIFF Subgroup
H04M 7/12 for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
Introduced: September 1968
Full Title
Arrangements for interconnection between switching centres > for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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