for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal

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

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

TELEPHONIC COMMUNICATION