[ Laboratory furniture; Protractors; Amplifiers and pre-amplifiers used to control feedback; ] Electroacoustic transducers; Electronic sensors for measuring sound; [ Artificial electroacoustic transducers for sight and hearing; ] Electroacoustic transducers for electronic and cybernetic automatons; [ Electronic sensors for the determination of positions and distances for use in robots; ] Three-dimensional electroacoustic transducers; Laboratory equipment and supplies, namely, reflectors of electromagnetic waves emitted by acoustic speakers, [ lightning apparatus, and air flow devices; ] Laboratory equipment and supplies, namely, sound filters; [ Acoustic membranes; Transducers that utilize infrasonic, sonic, and ultrasonic oscillations to test and manage stress in metal and nonmetal structures; ] Apparatus for recording, transmission or reproduction of sound and images; [ Sound and video recording and playback machines; Apparatus for speech recording and replaying; ] Measuring and control devices, namely, sonic analyzers; Electronic testing equipment, namely, electromagnetic radiation meters in the infrasound, sound, and ultrasound frequencies, [ sound and video level meters, ] phonometers, cavity resonators, resonators; Software for controlling and improving sound quality of audio equipment; portable electromagnetic radiation shields operating in the infrasound, sound, and ultrasound frequencies for electronic products