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The electrical telegraph is a telegraph that uses electric signals. The electromagnetic telegraph is a device for human-to-human transmission of coded text messages over wire. The electrical telegraph replaced such optical telegraphy systems as those designed by Claude Chappe for the French military, and Friedrich Clemens Gerke for the Prussian military.

Produktbeschreibung
The electrical telegraph is a telegraph that uses electric signals. The electromagnetic telegraph is a device for human-to-human transmission of coded text messages over wire. The electrical telegraph replaced such optical telegraphy systems as those designed by Claude Chappe for the French military, and Friedrich Clemens Gerke for the Prussian military.