Binoculars; Monoculars; Sextants; Telescopes; Timers; Angle dividing protractors; Camera flashes; Camera tripods; Directional compasses; Flash bulbs; Magnetic compasses; Magnifying glasses; Marine compasses; Signal bells; Warning bells; Bicycle helmets; Crash helmets; Diving helmets; Drivers' helmets; Football helmets; Motorcycle helmets; Protective helmets; Safety helmets; Skateboard helmets