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The bus loud-speaking device of the type "AGU-10-3" from the beginning of 1964 produced the Murom radio plant. The bus loudspeaker device of the type "AGU-10-3" is a low-frequency amplifier for notifying about the stops of passengers of the bus from the microphone and the transmission of radio programs. The nominal output power of the installation is 6 W, the maximum is 10 W. The range of reproducible sound frequencies is 150 ... 7000 Hz. The installation kit includes a microphone - MF-7B and six 1GD-18 loudspeakers on reflective boards.