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braunsche roehre with an anode voltage of several hundred volts, a gaskonzentrierten beam, a fluoreszenzschirm and a metallic coating on the inner wall between the less and the screen to oszillographieren high-frequency vibration above 10 hz
braunsche roehre with an anode voltage of several hundred volts, a gaskonzentrierten beam, a fluoreszenzschirm and a metallic coating on the inner wall between the less and the screen to oszillographieren high-frequency vibration above 10 hz