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Priority to ES0039206UpriorityCriticalpatent/ES39206Y/es
Publication of ES39206UpublicationCriticalpatent/ES39206U/es
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Publication of ES39206YpublicationCriticalpatent/ES39206Y/es
Un tubo de descarga eléctrica que comprende una rejlla de control y que tiene una atmósfera de gas. Con prioridad norteamericana de 11-12-52 número 327.220