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ES47264A1910-01-251910-01-25Un procedimiento para fabricar carbones y electrodos para hornos eléctricos, electrólisis y otros usos.
ExpiredES47264A3
(es)
Un procedimiento para componer, reformar, cambiar por otros nuevos y hacer cuantas operaciones se deseen o sean necesarias en los filamentos metálicos o de carbón en las lámparas eléctricas.