Inner tube and chisel: what they have in common

1. Step 1. Inner tube — uses — Compressed air. Air.
2. Step 2. Compressed air — is used in — Rock drill. Pneumatics.
3. Step 3. Rock drill — is used in — Tunnel. Driving the Mont Cenis tunnel.
4. Step 4. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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