37 INSTALLATION AND REPAIR OF APPARATUS AND INSTRUMENTS NAMELY, HEAT, WATER, GAS AND ELECTRICITY MEASURING DEVICES, NAMELY, METERS; installation and repair of HEAT, WATER, GAS AND ELECTRICITY CONSUMPTION RECORDING DEVICES, NAMELY, RECORDERS; HEAT, WATER, GAS AND ELECTRICITY CONTROL DEVICES, NAMELY, ELECTRONIC CONTROLS, ELECTRONIC UTILITY BILLING DEVICES COMPRISED OF COMPUTER HARDWARE AND OPERATING SOFTWARE FOR USE IN CALCULATING HEAT, WATER, GAS, ELECTRICITY, AND UTILITIES CONSUMPTION, AND FOR METERING, RECORDING AND INVOICING HEAT, WATER, GAS, AND ELECTRICITY USAGE AND UTILITY COSTS; installation and repair of APPARATUS AND INSTRUMENTS, NAMELY HEAT, WATER, GAS, ELECTRICITY AND UTILITY DATA PROCESSORS; HEAT, WATER, GAS, ELECTRICITY AND UTILITY DATA TRANSMISSION DEVICES, NAMELY TRANSMITTERS, USED TO PROCESS, REPRODUCE AND TRANSMIT DATA RELATED TO MEASURING, METERING, RECORDING, CONTROLLING AND INVOICING HEAT, WATER, GAS, AND ELECTRICITY USAGE AND UTILITY COSTS, ALL FOR USE IN THE SANITATION AND HEATING FIELDS