Potential answers for "Transistor's forerunner"

⭐⭐⭐⭐ TRIODE
⭐⭐ EMITTERS
⭐⭐ EMITTER
⭐⭐ AMRADIO
⭐⭐ CHIP
⭐⭐ VACUUMTUBE
⭐⭐ BELLLABS
⭐⭐ WAFERS

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