Gramophone and bicycle: what they have in common

1. Step 1. Gramophone — evolved from — Phonograph. A flat disc instead of a cylinder.
2. Step 2. Phonograph — has part — Diaphragm. A diaphragm with a needle.
3. Step 3. Diaphragm — is part of — Drum. A diaphragm.
4. Step 4. Drum — is made of — Leather. The drumhead is stretched hide.
5. Step 5. Leather — is material for — Saddle. A saddle is made of leather.
6. Step 6. Saddle — is part of — Bicycle. The bicycle saddle took its name from the horse saddle.

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