Ice machine and telephone: what they have in common

1. Step 1. Ice machine — evolved into — Refrigerator. Machine-made cold.
2. Step 2. Refrigerator — has part — Thermostat. A thermostat.
3. Step 3. Thermostat — has part — Bimetallic strip. A classic thermostat is bimetallic.
4. Step 4. Bimetallic strip — is used in — Circuit breaker. The thermal trip is a bimetal strip.
5. Step 5. Circuit breaker — is made of — Bakelite. The body is Bakelite.
6. Step 6. Bakelite — is material for — Telephone. The body of classic telephones is Bakelite.

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