Piano hammer and screw press: what they have in common

1. Step 1. Piano hammer — is part of — Piano. Hammers strike the strings.
2. Step 2. Piano — has part — Keyboard. A keyboard.
3. Step 3. Keyboard — is part of — Linotype. A keyboard.
4. Step 4. Linotype — evolved from — Movable type. Mechanized typesetting.
5. Step 5. Movable type — is part of — Gutenberg printing press. Text is set from metal type.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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