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Ultrasonic signal generators and an audio frequency generator "G3-33" and "G3-34" from I quarter of 1962 produced the Velikie Luki Radio Plant. The ultrasonic signal generator "G3-33" and the audio signal generator "G3-34" are designed to adjust and control the sound and receiving equipment. The generator "G3-33" covers the frequency range from 20 Hz to 200 kHz, the generator "G3-34" covers the range from 20 Hz to 20 kHz. The design and design of the generators are the same.