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The mini-piano case "Octava" was produced in the early 80s of the 20th century by the Brest MP "Leader". The souvenir is intended for children under 10 years old to acquire the initial musical concepts and skills. It has the following characteristics, a built-in loudspeaker with an amplifier, reproduction of sound from a note "salt" of a small octave to a note "mi" of the second octave, power supply 2 elements, 1.5 V each.