operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals

Full Title

Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code > Apparatus or circuits at the receiving end > operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION