9 ELECTRIC AND ELECTRONIC DEVICES, APPARATUS AND INSTRUMENTS FOR BUILDING, COMMUNICATION, AND ENVIRONMENTAL TECHNOLOGY AND ELECTRICAL ENGINEERING, NAMELY, TRANSFORMERS, TRANSDUCERS THAT UTILIZE ULTRASONIC OSCILLATIONS TO TEST FOR AND TO TREAT AND REDUCE STRESS AND FATIGUE IN METALS AND METAL STRUCTURES, SWITCHES, RECTIFIERS, WATT METERS, OHM METERS, AM METERS, VOLT METERS, INDUCTORS, RESISTERS, CHOKES, RADIO TRANSMITTERS, TELEPHONE TRANSMITTERS, TELEPHONE RECEIVERS, AUDIO RECEIVERS, VIDEO RECEIVERS, TRANSCEIVERS, ELEVATOR CONTROLS, CRANE CONTROLS; ELECTRIC APPARATUS, DEVICES AND INSTRUMENTS FOR RECORDING, TRANSMISSION, TRANSFER AND REPRODUCTION OF SOUND AND IMAGES, NAMELY, SOUND AND VIDEO CASSETTE RECORDERS, SOUND AND VIDEO AMPLIFIERS, SOUND AND VIDEO RECEIVERS, SOUND AND VIDEO TRANSMITTERS; DATA PROCESSORS AND COMPUTERS; MODEMS FOR CONNECTING COMPUTERS, TELEPHONES, FACSIMILE MACHINES AND TELEMONITORED DEVICES AS PART OF COMMUNICATION EQUIPMENT; BLANK MAGNETIC DATA CARRIERS; ELECTRICITY METERS