OPTIS

CIRCUITRY FOR INCREASING THE ACCURACY OF RECEIVED DATA, FOR INCREASING THE POWER OF TRANSMITTED DATA, FOR PROVIDING SURGE PROTECTION, AND FOR HIGH-FREQUENCY NOISE FILTERING; AND UNINTERRUPTIBLE POWER SUPPLIES EXCLUDING SUCH CIRCUITRY INTENDED FOR USE ON ELEVATORS, ESCALATORS, RELATED CARRIERS, CONTROLS FOR ELEVATORS, ESCALATORS, RELATED CARRIERS AND APPARATUS FOR USE IN THE SERVICING OF ELEVATORS, ESCALATORS, AND RELATED CARRIERS