ISO 3166-1 [1 ] es la primera parte del estándar internacional de normalización ISO 3166, publicado por la Organización Internacional de Normalización (ISO), que proporciona códigos para los nombres de países y otras dependencias…
Many industrial, military or otherwise professional tubes were also produced. Only a few types are still used today, mainly in high-power, high-frequency applications and also in boutique guitar amplifiers.