Overhead crane and typewriter: what they have in common

1. Step 1. Overhead crane — is part of — Steel works. Overhead cranes.
2. Step 2. Steel works — has part — Blast furnace. Blast furnaces.
3. Step 3. Blast furnace — has part — Bellows. Air was blown in by bellows, later by blowers.
4. Step 4. Bellows — is part of — Pipe organ. Bellows supply the air.
5. Step 5. Pipe organ — has part — Keyboard. Manuals were the first keyboards.
6. Step 6. Keyboard — is part of — Typewriter. The keys drive levers with type.

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