Theremin and incandescent light bulb: what they have in common

1. Step 1. Theremin — has part — Oscillator. Beat-frequency oscillators.
2. Step 2. Oscillator — is part of — Radio. A carrier frequency oscillator.
3. Step 3. Radio — includes — Transistor radio. A radio receiver.
4. Step 4. Transistor radio — has part — Dry cell. Batteries.
5. Step 5. Dry cell — is part of — Torch (flashlight). Batteries.
6. Step 6. Torch (flashlight) — has part — Incandescent light bulb. A bulb (today an LED).

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