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Book
Year: 1977 Publisher: Bruxelles : Belgique. Comité national d'action pour la sécurite et l'hygiène dans la construction,
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Accidents --- Signal devices --- Illuminating --- Prevention. --- Signal devices --- Illuminating
Book
Year: 1961 Publisher: Washington : American Association of State Highway Officials,
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Specifications --- Traffic signals --- Signal devices --- Specifications --- Traffic signals --- Signal devices
Book
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Standards. --- Roads. --- Recommendations --- Signal devices --- Recommendations --- Signal devices
Book
Year: 1979 Publisher: Braunschweig : Technische Universität Carolo-Wilhelmina, Fachbereich für Bauingenieur und Vermessungswesen,
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Railroads. --- Railroad signals --- Signal lights --- Signal devices --- Flags --- Comparison --- History --- Railroad signals --- Signal lights --- Signal devices --- Flags --- Comparison --- History
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