dental office equipment and supplies, namely, amalgam mixers and dispensers, composite-restorative light-curing units, medical x-ray machines, bacterial plaque removers, calculus removal units, intra-oral reflector lights, adjustable dental chairs, dental handpieces, thee-way injection syringes, dental air motors specially adapted for use with dental drills and handpieces, dental drills and doriots, suction systems, namely, aspirators, cuspidors, surgical compressors, dental stools, dental steam sterilizers, tray with air and water supply on articulated arms and on mobile stands specially designed for transporting and holding dental instruments