Potential answers for "Communication system of old"

⭐⭐⭐⭐ TELEX
⭐⭐⭐ ASL
⭐⭐⭐ TELETYPE
⭐⭐⭐ SEMAPHORE
⭐⭐⭐ MORSE
⭐⭐⭐ INTRANET

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