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Since 1957, the sound and ultrasonic frequency generator "ZG-11" produced the Velikoluksky radio plant. "ZG-11" is a sound generator from 20 Hz to 20 KHz and ultrasonic from 20 to 200 KHz frequencies. Generator "ZG-11" is designed to configure the sound paths of radio and television devices in laboratory and factory conditions. More information about the device with diagrams in the directory.