Electric motor and watt steam engine: what they have in common

1. Step 1. Electric motor — is part of — Hybrid car. An electric motor.
2. Step 2. Hybrid car — has part — Planetary gear. The Toyota Hybrid System splits power with a planetary gear.
3. Step 3. Planetary gear — is part of — Watt steam engine. Watt’s “sun and planet” gear got around the patent on the crank.

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