Window glass and bellows: what they have in common

1. Step 1. Window glass — uses — Casting. The panes were cast in moulds.
2. Step 2. Casting — is used in — Linotype. It casts a line of type in metal.
3. Step 3. Linotype — has part — Keyboard. A keyboard.
4. Step 4. Keyboard — is part of — Pipe organ. Manuals were the first keyboards.
5. Step 5. Pipe organ — has part — Bellows. Bellows supply the air.

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