73027845
Jul 26, 1974
Jan 17, 1978
UNINTERRUPTIBLE POWER SUPPLY SYSTEMS, COMPRISING RECTIFIERS, REGULATORS, INVERTERS, POWER AMPLIFIERS, AC-DC POWER SUPPLIES ORDINARILY USED FOR POWERING OTHER ELECTRICAL OR ELECTRONIC EQUIPMENT, AND OTHER POWER CONVERSION APPARATUSES FOR USE WITH COMPUTERS, PROCESS CONTROLS, COMMUNICATION LINKS AND NAVIGATIONAL EQUIPMENT
Electrical and Scientific Apparatus