Digital voice signal processors; Electronic transmitters for jamming signals; Digital sound processors; Loudspeakers for sound masking; Vehicle locator and recovery device programmed to use global positioning systems (GPS) and cellular telecommunications; Road signs, luminous or mechanical; Shoes for protection against accidents, irradiation and fire; Electrical annunciators; Gloves for protection against X-rays for industrial purposes; Filters for radio interference suppression; Electrical s...