Diesel engine and bellows: what they have in common

1. Step 1. Diesel engine — has part — Cylinder. Cylinders.
2. Step 2. Cylinder — is part of — Steam hammer. A steam cylinder.
3. Step 3. Steam hammer — evolved into — Forging press. Pressing instead of striking.
4. Step 4. Forging press — uses — Forge. The workpiece is heated in a forge before pressing.
5. Step 5. Forge — has part — Bellows. Bellows fan the fire of the forge.

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