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Railroads -- Cars -- Lubrication --- Inventions --- Patents -- United States
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Adhesives, Hot melt --- Patents --- Adhesives, Hot melt - Patents --- Patents - United States
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Signals and signaling --- Telegraph -- United States --- Cipher and telegraph codes -- Patents -- United States --- Black --- O'Reilly
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Bibliographie. --- Développement économique. --- Economic development. --- Innovation. --- Inventions. --- Patent. --- Patents. --- Wirtschaft. --- Wirtschaftswachstum. --- Economic development. --- Inventions. --- Patents -- United States -- Statistics.
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