ES88254A1 - Un procedimiento para fabricar filamentos de wólfram de forma espiral y largos cristales para lámparas eléctricas incandescentes.
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Un procedimiento para fabricar filamentos de wólfram de forma espiral y largos cristales para lámparas eléctricas incandescentes.
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ES88254A1924-02-041924-02-04Un procedimiento para fabricar filamentos de wólfram de forma espiral y largos cristales para lámparas eléctricas incandescentes.
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