Category:Optical telegraphs

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Deutsch: optische Telegrafen, Zeigertelegraphen
Suomi: Optinen lennätin
Français : télégraphes optiques

Subcategories

This category has the following 5 subcategories, out of 5 total.

Media in category "Optical telegraphs"

The following 74 files are in this category, out of 74 total.