Horse collar and radio: what they have in common

1. Step 1. Horse collar — is part of — Horse collar. A rigid ring on the horse’s shoulders.
2. Step 2. Horse collar — is made of — Leather. The collar and traces are leather.
3. Step 3. Leather — is material for — Drum. The drumhead is stretched hide.
4. Step 4. Drum — works like — Drum machine. An electronic drum.
5. Step 5. Drum machine — has part — Oscillator. Analogue oscillators.
6. Step 6. Oscillator — is part of — Radio. A carrier frequency oscillator.

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