Mosin rifle and liquid-propellant rocket engine: what they have in common

1. Step 1. Mosin rifle — has part — Bolt action. A bolt action.
2. Step 2. Bolt action — uses — Cartridge. A unitary cartridge.
3. Step 3. Cartridge — uses — Smokeless powder. Modern cartridges.
4. Step 4. Smokeless powder — is material for — Solid rocket motor. The propellant is smokeless powder.
5. Step 5. Solid rocket motor — is part of — Space Shuttle. Boosters.
6. Step 6. Space Shuttle — has part — Liquid-propellant rocket engine. Hydrogen-fuelled main engines.

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