Mortar (weapon) e motor diesel: o que têm em comum

1. Passo 1. Mortar (weapon) — evoluiu de — Howitzer. High-angle fire.
2. Passo 2. Howitzer — tem como parte — Recoil mechanism. Recoil mechanisms.
3. Passo 3. Recoil mechanism — faz parte de — Tank gun. Recoil mechanisms.
4. Passo 4. Tank gun — faz parte de — Tank. A gun in a rotating turret.
5. Passo 5. Tank — tem como parte — Motor diesel. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).

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