Railway switch und telephone: was sie gemeinsam haben

1. Schritt 1. Railway switch — ist Teil von — Railway track. Switches.
2. Schritt 2. Railway track — inspirierte — Time zones. Introduced because of railway timetables.
3. Schritt 3. Time zones — nutzt — Electrical telegraph. Synchronizing time by telegraph.
4. Schritt 4. Electrical telegraph — entwickelte sich zu — Telephone. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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