Forging press and tank: what they have in common

1. Step 1. Forging press — has part — Hydraulic cylinder. Working cylinders.
2. Step 2. Hydraulic cylinder — is part of — Bulldozer. The blade is raised by hydraulics.
3. Step 3. Bulldozer — evolved from — Holt tracked tractor. A bulldozer is a tracked tractor with a blade.
4. Step 4. Holt tracked tractor — inspired — Tank. The British designers of the first tanks drew on the experience of Holt’s tracked tractors.

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