Cloth beam and steam locomotive: what they have in common

1. Step 1. Cloth beam — is part of — Loom. It winds up the finished cloth.
2. Step 2. Loom — evolved into — Power loom. A mechanized loom.
3. Step 3. Power loom — has part — Watt steam engine. Driven by a steam engine.
4. Step 4. Watt steam engine — is part of — Steam locomotive. A steam locomotive is driven by a steam engine.

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