Anvil hardy hole and piston pump: what they have in common

1. Step 1. Anvil hardy hole — is part of — Anvil. A socket for an insert tool.
2. Step 2. Anvil — is used in — Forge. Forging on an anvil.
3. Step 3. Forge — is used in — Forging press. The workpiece is heated in a forge before pressing.
4. Step 4. Forging press — evolved from — Steam hammer. Pressing instead of striking.
5. Step 5. Steam hammer — has part — Cylinder. A steam cylinder.
6. Step 6. Cylinder — is part of — Piston pump. The piston moves in a cylinder.

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