implemented by means of portable electronic directories

Full Title

Substation equipment, e.g. for use by subscribers > Devices for calling a subscriber > Devices whereby a plurality of signals may be stored simultaneously > with provision for storing more than one subscriber number at a time > using static electronic memories, e.g. chips > implemented by means of portable electronic directories

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

TELEPHONIC COMMUNICATION