Potential answers for "Low-tech communication method"

⭐⭐⭐⭐ TINCANTELEPHONE
⭐⭐⭐ VIDEOTEX
⭐⭐⭐ ASL
⭐⭐⭐ WAGGLEDANCE
⭐⭐⭐ ESP
⭐⭐⭐ EMAIL
⭐⭐⭐ DRONE
⭐⭐⭐ SIGNLANGUAGE
⭐⭐⭐ SONAR

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