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ES4957A1885-03-301885-03-30Un nuevo procedimiento para la solidificación del ácido fosfórico con cuerpos porosos de origen mineral u orgánico.
ExpiredES4957A1
(es)
Un aparato de nuevo sistema para el atalaje automático, el cual se desengancha lateralmente y se aplica ventajosamente a los carruajes o vagones de los ferrocarriles.
Un nuevo procedimiento de perfeccionamiento de pavimento de madera que consiste en la manera de sostener los blocs o cañas de madera por medio de unos bloques.