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Priority to ES44967ApriorityCriticalpatent/ES44967A1/es
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ES44967A1909-02-241909-02-24Mejoras en el tratamiento de los alquitranes y las reinas para hacerlos más adecuados a los usos industriales.
ExpiredES44967A1
(es)
Perfeccionamientos en los hornos para fabricar carbón de madera por la carbonización de residuos industriales especialmente en las fábricas de aceites.