Scientific, photographic, optical, weighing, measuring, signalling, checking, life-saving and teaching apparatus and instruments, namely, glass tubes for scientific use, solid state light based emissive imagers, image analyzers, namely, microscopes, image intensifiers, cameras, videorecorders, video receivers, video transmitters, scanners, document printers, computer monitors, calibration devices for calibrating surgical, medical, dental and veterinary apparatus used in particular in medical ...