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DK46263D1930-03-051931-03-04Fremgangsmaade til Emulgering af bituminøse Stoffer, Tjære, Beg og lignende, særlig til Fremstilling af Vejbelægninger.
DK46263C
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Perfeccionamientos en la obtención de hidrocarburos líquidos, particularmente en la obtención de carburantes líquidos procediendo desde combustibles sólidos.