Oscillator and saw: what they have in common

1. Step 1. Oscillator — is part of — Pacemaker. A pulse generator.
2. Step 2. Pacemaker — has part — Lithium-ion battery. A lithium battery (lithium–iodine).
3. Step 3. Lithium-ion battery — is part of — Electric bicycle. A battery.
4. Step 4. Electric bicycle — has part — Roller chain. The chain drive from the pedals remains.
5. Step 5. Roller chain — is part of — Chainsaw. The cutting chain is a roller chain with teeth.
6. Step 6. Chainsaw — evolved from — Saw. A mechanized saw.

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