Ladder und railway semaphore: was sie gemeinsam haben

1. Schritt 1. Ladder — nutzt — Inclined plane. Climbing to a height.
2. Schritt 2. Inclined plane — wird verwendet in — Egyptian pyramid. According to a common hypothesis, the blocks were raised on ramps.
3. Schritt 3. Egyptian pyramid — nutzt — Lever. Levers were used to move the blocks.
4. Schritt 4. Lever — wird verwendet in — Railway semaphore. The semaphore is set by a lever.

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