Inverter and syringe: what they have in common

1. Step 1. Inverter — is part of — Electric car. An inverter powers the traction motor.
2. Step 2. Electric car — has part — Car brake. Besides regeneration, ordinary friction brakes are needed.
3. Step 3. Car brake — has part — Brake caliper. A caliper.
4. Step 4. Brake caliper — has part — Piston. Pistons.
5. Step 5. Piston — is part of — Syringe. A plunger.

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