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This is the schematic symbol of an old radio tube from the 1940´s. It´s the UCH4 Triode-heptode.…
Music vectors are popular design footage. Download black background with colorful music notes and equalizer graphic..…
The symbol used for a Non-Directional Beacon (NDB) on air navigation charts.…
Free helicopter toy vector graphics on pop art dots background. Download free vector illustration of radio-controll..…