Light switches; Multi-function electronic device for use in children's rooms comprising a sound producing function, temperature gauge and also including a clock and nightlight; Neon signs; Portable radios; Portable sound reproducing apparatus; Projector lamps; Projectors particularly projectors for the entertainment industry; Rigid and flexible endoscopes for non-medical use; Sound amplifiers; Water treatment equipment, namely, fertilizer injection devices which connect to a water distributio...