Potential answers for "Transistor predecessor"

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

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