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SECALL BAN S FRANCISCO
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SECALL BAN S FRANCISCO
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Application filed by SECALL BAN S FRANCISCOfiledCriticalSECALL BAN S FRANCISCO
Priority to ES0006179UpriorityCriticalpatent/ES6179Y/es
Publication of ES6179UpublicationCriticalpatent/ES6179U/es
Application grantedgrantedCritical
Publication of ES6179YpublicationCriticalpatent/ES6179Y/es
Perfeccionamientos en los tubos para calefacción eléctrica caracterizados esencialmente por disponer el filamento-resistencia dentro de un tubo aislante rellenando a éste de un polvo mineral no conductor de la corriente eléctrica que a la temperatura a que se eleve la resistencia sea incapaz de reaccionar con ella; y en rellenar con la misma substancia u otra de análogas condiciones el espacio o juego que resta entre el tubo aislante y el de metal
ES0006179U1940-12-311940-12-31Perfeccionamientos en los tubos para calefacción eléctrica.
ExpiredES6179Y
(es)