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ES2964A1882-12-301882-12-30Un procedimiento perfeccionado de transmisión de la electricidad para alumbrado, fuerza motriz y otros usos.
ExpiredES2964A2
(es)
Un procedimiento de calefacción previa del aire, que alimenta la combustión de una pieza metálica, para hacer más intensos los efectos luminosos de aquellas.