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List of French flags - Wikipedia
Optical telegraph - Wikipedia
How Napoleon's semaphore telegraph changed the world - BBC
Why has France has changed the blue on its flag? - BBC
Flag of France - Wikipedia
Flag of France | History & Meaning | Britannica
The National Flag of France: What You Should Know! - French …
The French flag - Élysée
History of the French flag - France This Way
The French Flag - Ministry for Europe and Foreign Affairs