ID 209651950 © Byamberdesign | Megapixl.com
Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
beam cathode coil deflection device devices diode electrical electrodes electron electronic focusing glass gun high inner intended metal observations old oscilloscope pentode phosphorcoated picture plates processes purposes radio ray registration screen special technology thermionic triode tube vacuum valve various vintage visual voltage