Wooden rifle stock and railway semaphore: what they have in common

1. Step 1. Wooden rifle stock — is part of — Mosin rifle. A wooden stock.
2. Step 2. Mosin rifle — is a kind of — Rifle. A rifle.
3. Step 3. Rifle — has part — Trigger. The trigger releases the firing pin and the rifle fires.
4. Step 4. Trigger — uses — Lever. A lever mechanism.
5. Step 5. Lever — is used in — Railway semaphore. The semaphore is set by a lever.

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