Vacuum sealer and centrifugal pump: what they have in common

1. Step 1. Vacuum sealer — has part — Vacuum pump. A pump.
2. Step 2. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.
3. Step 3. Piston pump — is part of — Fire pump. A fire pump is a piston pump.
4. Step 4. Fire pump — evolved into — Fire truck. A pump on a motor-vehicle chassis.
5. Step 5. Fire truck — has part — Centrifugal pump. A fire pump.

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