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G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
G08B5/008—Traffic signalling mirrors
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FR634718D1927-05-201927-05-20Panonceaux à miroir pour faciliter le problème de la circulation des véhicules sur les voies publiques
ExpiredFR634718A
(fr)