GAVI

AUDIO-VISUAL PROJECTION UNITS COMPRISING PROJECTORS, VIEWING SCREENS, AUDIO AMPLIFIERS AND AUTOMATIC LAMP CHANGERS, AND COMPONENTS AND ACCESSORIES THEREFOR-NAMELY, INTEGRAL AUDIO SYNCHRONIZERS, SCREEN ATTACHMENTS FOR SHOWING MIXED HORIZONTAL AND VERTICAL SLIDES, JACKS FOR EXTERNAL SPEAKERS, PROJECTION LENSES AND FRONT PROJECTION ATTACHMENTS