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ES47465A1910-02-281910-02-28Una disposición en las lámparas de arco voltaico para conseguir que quede bien limpia la pared del globo.
ExpiredES47465A3
(es)
Una asilla con su correspondiente procedimiento de fabricación, para la unión de los hilos incandescente de tungsteno y de sus aleaciones en las lámparas eléctricas incandescentes con los hilos conductores de la corriente.