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Sound Recorders and Reproducers, Sound Amplifiers, Microphones, Earphones, Wireless Microphones, Wireless Earphones, Transmitters for Wireless Earphones, Receivers for Wireless Microphones, Power Supplies for Sound Recorders, Sound Amplifiers, and for Transmitters and Receivers for Wireless Microphones and Earphones and Parts Therefor; Audio Voltmeters and Impedance Meters