Crossword puzzle clue "communication system of old"

Here are the possible solutions for communication system of old clue

Answer
Clue
Relevancy
teletype
Clue
Old communication system
telex
Clue
Communication system of old
userinterface
Clue
System-to-system system
asl
Clue
Silent communication system: Abbr.
Nonverbal communication system: Abbr.
Communication system pioneered by Thomas Gallaudet, for short
Communication system for the hearing-impaired: Abbr.
Communication system for the gorilla Koko: Abbr.

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