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R Leutwyler Y Cia
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R Leutwyler Y Cia
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Priority to ES83667ApriorityCriticalpatent/ES83667A1/es
Publication of ES83667A1publicationCriticalpatent/ES83667A1/es
ES83667A1922-12-011922-12-01Procedimiento para regenerar lámparas eléctricas de incandescencia con filamentos en forma de espiral y rellenos de gas.
ExpiredES83667A1
(es)