Artificial heart and electric generator: what they have in common

1. Step 1. Artificial heart — has part — Piston pump. A pulsatile pump.
2. Step 2. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.
3. Step 3. Vacuum pump — has part — Stator. A cylindrical chamber.
4. Step 4. Stator — is part of — Electric generator. The stationary part with the windings.

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