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Compteurs Schlumberger SA
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Compteurs Schlumberger SA
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Priority to ES94481ApriorityCriticalpatent/ES94481A1/es
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ES94481A1925-07-081925-07-08Un adaptador para conectar en serie los filamentos de las lámparas de los receptores de telegrafía y telefonía sin hilos.
ExpiredES94481A1
(es)
Mejoras en los dispositivos para la descarga de electrones y en las disposiciones de circuito que los emplean para la telefonía, telegrafía sin hilos, producción de corrientes alternas y para otros fines.