220235 ⎘
Gain control in amplifiers or frequency changers without distortion of the input signal; Manually-operated control in frequency-selective amplifiers
Sub-classes:RADIOFREQUENCY DEVICE WITH MULTIPLE OPERATING MODES
#2PARAMETER SETTING DEVICE AND PARAMETER SETTING METHOD
#3Audio amplification devices with integrated light elements for enhanced user safety
#4Amplifier for cable and terrestrial applications with independent stage frequency tilt