Mine ventilation and knife: what they have in common

1. Step 1. Mine ventilation — is used in — Tunnel. Ventilation.
2. Step 2. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.
3. Step 3. Chisel — has part — Handle. A wooden or plastic handle.
4. Step 4. Handle — is part of — Knife. A handle.

Open Evothings