42 door to door and catalog sales featuring medical imaging diagnostic and therapeutic equipment, accessories, and supplies, industrial non-destructive testing equipment; namely, quality control and technical aids screens, cassettes and film holders, film identification devices, darkroom and processing equipment, film viewing storage and handling equipment, protective equipment and materials, X-ray inspection particle equipment and supplies, and X-ray film and radiographic supplies accessories, and supplies; designing rooms for medical imaging diagnostic and therapeutic equipment and designing systems of medical imaging diagnostic and therapeutic equipment for customer needs