Fire lance and shipping container: what they have in common

1. Step 1. Fire lance — uses — Gunpowder. A gunpowder charge.
2. Step 2. Gunpowder — evolved into — Smokeless powder. A replacement for black powder.
3. Step 3. Smokeless powder — is material for — Solid rocket motor. The propellant is smokeless powder.
4. Step 4. Solid rocket motor — is used in — Multiple rocket launcher. Rockets.
5. Step 5. Multiple rocket launcher — has part — Truck. On a truck chassis.
6. Step 6. Truck — uses — Shipping container. A container moves from ship to truck without being unloaded.

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