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ES867A1880-04-011880-04-01Un procedimiento, constituyendo un nuevo sistema de calefacción directa, por medio del gas y sin generador especial.
ExpiredES867A1
(es)
Un aparato de nuevo sistema de calefacción por medio del petróleo, aplicable a la cocción de los alimentos y a cuantos aparatos necesiten un grado de calor determinado y constante, sin el cuidado de persona alguna en todo el tiempo que funciona.