9 Glass tubes and prisms for scientific purposes; compasses; surveying chains and levels; electrical circuits, conductors and connectors; motion picture and photographic cameras, camera cases and tripods; optical discs, filters, lens sighs, mirrors and scanners; scales; measuring cups and spoons; tape measures; lasers for measuring purposes; signal bells, processors and whistles; life belts, buoys, jackets, nets and preservers; audio tape and video cassette recorders; audio mixers and speakers; event recorders; radio, telephone and television signal transmitters; blank magnetic data carriers; blank discs for computers; vending machines; cash registers; calculators; data processors; computers; fire extinguishers