broadcast, radio, radio valves Telefunken, Germany, 1934, 1930s, 30s, 20th century, historic, historical, radio valve, valve, radio valves, valves, triode, triodes, tetrodes and pentodes, REN- und RENS series, ACH 1, German Reich patent, technics, engineering, technology, technologies, component, components, Additional-Rights-Clearences-Not Available

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Keywords: 1, 1930s, 20th, 30s, ach, broadcast, century, component, components, engineering, german, germany, historic, historical, patent, pentodes, radio, reich, ren-, rens, series, technics, technologies, technology, telefunken, tetrodes, triode, triodes, und, valve, valves