Ear plugs for divers, measuring glassware, glassware for scientific experiments in laboratories, optical glasses, electric arc welders, electric arc cutting apparatus, electric welding machines, ozonisers, electrolysers, egg-candlers, cash registers, coin counting or sorting machines, electric sign boards for displaying target figures, current outputs or the like, photo-copying machines, hand-operated calculators, time and date stamping machines, time recording apparatus, punched card office machines, voting machines, automated billing machines for processing accounting information, vending machines, metered gasoline pumps for service stations, fire extinguishers, fire hose nozzles, sprinkler systems for fire protection, fire alarms, gas alarms, protective helmets, railway signals, luminous or mechanical, vehicle breakdown warning triangles, road signs, luminous or mechanical, arcade games adapted for use with an external display screen or monitor, electric door openers, simulators for the steering and control of vehicles, electronic sports training simulators, laboratory apparatus and instruments, namely, scientific instrumentation for measuring concentrations of chemicals in liquid, measuring or testing machines and instruments in the nature of concentration meters; power distribution or control machines and apparatus in the nature of electrical controllers, rotary converters, batteries and electrical cells, electric or magnetic meters and testers in the nature of metal detectors; electric wires and cables, electric flat irons, electric buzzers, electronic machines, apparatus and their parts in the nature of electronic analyzers for testing and analyzing chemical and biological substances for the presence, absence, or quantity of target chemicals, biologics, and contaminants; magnetic cores, resistance wires, electrodes, fire boats, fire engines, cigar lighters for automobiles, gloves for protection against accidents, respirators for filtering air other than for artificial respiration, gas masks, welding masks, fireproof garments, eye glasses, computer game software in the nature of consumer games adapted for use with an external display screen or monitor, electronic circuits and CD-ROMs recorded with programs for hand-held games with liquid crystal displays, wet suits for scuba diving, inflatable swimming floats, protective helmets for sports, air tanks, swimming flutter boards, regulators for scuba diving, metronomes, electronic circuits and CD-ROMs recorded with automatic performance programs for electronic musical instruments, slide-rules, exposed cinematographic films, exposed slide films, slide film mounts, video discs and videotapes recorded with animation