Answer:

telex

Answer	Crossword Clue
TELEX	Fax's relative
TELEX	Fax precursor
TELEX	Old Western Union service

TELEX	Old Western Union message
TELEX	Fax ancestor
TELEX	Fax forerunner
TELEX	Fax predecessor
TELEX	Pre-fax communication
TELEX	Bygone communication
TELEX	E-mail predecessor
TELEX	Outmoded communications system

TELEX	Pre-fax communications system
TELEX	Pre-Internet communication
TELEX	Western Union's 1958 innovation
TELEX	Fax machine's forefather
TELEX	Type of network once employed by Western Union
TELEX	E-mail forerunner
TELEX	Fax's predecessor
TELEX	Outdated messager

TELEX	Bygone messager
TELEX	Electronic communication method
TELEX	Global communications device
TELEX	Old means of communication
TELEX	Old-style fax
TELEX	Fax's older cousin
TELEX	Old-style communication
TELEX	Old-fashioned message transmission

TELEX	Communication service
TELEX	Communication method
TELEX	Typewriter of sorts
TELEX	Kind of message
TELEX	Communications device
TELEX	Message-sending method
TELEX	Kind of dialed message
TELEX	Message medium

TELEX	Communicate with quickly
TELEX	Pre-fax transmission
TELEX	Obsolescent communication
TELEX	Outdated means of communication
TELEX	Wire message