Vacuum tube und railway semaphore: was sie gemeinsam haben

1. Schritt 1. Vacuum tube — entwickelte sich zu — Diode. The first diode was a vacuum tube (Fleming); later diodes became semiconductor devices.
2. Schritt 2. Diode — umfasst — LED. A light-emitting diode.
3. Schritt 3. LED — ist Teil von — Traffic light. LEDs.
4. Schritt 4. Traffic light — entwickelte sich aus — Railway semaphore. The first traffic light was a railway-style semaphore.

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