3D printer e railway semaphore: o que têm em comum

1. Passo 1. 3D printer — utiliza — Program control of a machine. The layers are set by a program (G-code), as with CNC.
2. Passo 2. Program control of a machine — é utilizado em — Zuse Z3. The program was on punched cinema film.
3. Passo 3. Zuse Z3 — tem como parte — Relay. 2,600 relays.
4. Passo 4. Relay — faz parte de — Traffic light. Relay controllers.
5. Passo 5. Traffic light — evoluiu de — Railway semaphore. The first traffic light was a railway-style semaphore.

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