Sword and newcomen engine: what they have in common

1. Step 1. Sword — has part — Handle. A handle.
2. Step 2. Handle — is part of — Hammer. A handle.
3. Step 3. Hammer — evolved into — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
4. Step 4. Steam hammer — has part — Boiler. A boiler supplies the steam.
5. Step 5. Boiler — is part of — Newcomen engine. Steam from the boiler.

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