Panel building and knife: what they have in common

1. Step 1. Panel building — uses — Prefabrication. Assembled from panels.
2. Step 2. Prefabrication — uses — Interchangeable parts. Standard elements.
3. Step 3. Interchangeable parts — is used in — Cotton gin. Whitney was one of the promoters of interchangeable parts.
4. Step 4. Cotton gin — has part — Crank. The drum was turned by a handle.
5. Step 5. Crank — is part of — Meat grinder. A handle.
6. Step 6. Meat grinder — has part — Knife. A cross-shaped blade.

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