preventing metering of tax-free calls to certain lines, e.g. to fire or ambulance stations

Full Title

Arrangements for metering, time-control or time-indication > Metering calls from calling party > Discriminative metering > preventing metering of tax-free calls to certain lines, e.g. to fire or ambulance stations

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

TELEPHONIC COMMUNICATION