Data processing equipment, namely, computers, data processors, couplers, memories for data processing equipment, electronic data processing apparatus, interface cards for data processing equipment in the form of printed circuits; Recorded computer software for use in database management, for use as a spreadsheet, for word processing, for use in sound recording; Recorded computer game software for recreational game playing purposes; Photocopying machines; Sound locating instruments, namely, sonars, sonar equipment and parts thereof; Sound reproduction apparatus; Interactive learning devices, namely, computer game programs, interactive game software; interactive video game programs; Slide projectors; Teaching aid apparatus, namely, video projectors; Electronic sensors for sound for use in teaching; Instruments containing eyepieces, namely, microscopes, telescopes; Integrated circuit chips for encoding and decoding digital video, and for digital video compression and decompression; Optical glasses; Battery chargers; Batteries