Track link and telephone: what they have in common

1. Step 1. Track link — is part of — Continuous track. A track is made up of track links.
2. Step 2. Continuous track — is part of — Tank. Tracks let a tank cross trenches and rough ground.
3. Step 3. Tank — has part — Machine gun. The Mark I’s machine guns.
4. Step 4. Machine gun — has part — Spring. A return spring.
5. Step 5. Spring — is part of — Rotary dial. A return spring.
6. Step 6. Rotary dial — is part of — Telephone. A dial.

Open Evothings