ELECTROTECHNICAL, ELECTRONIC AND ELECTRICAL DEVICES, APPARATUS AND INSTRUMENTS FOR USE IN INDUSTRIAL OPERATIONS TO MEASURE AND CONTROL PRESSURE, ABSOLUTE PRESSURE, DIFFERENTIAL PRESSURE, TEMPERATURE, LEVEL AND FLOW, NAMELY, METERS, SENSORS AND TRANSMITTERS FOR MEASURING AND CONTROLLING ANY ONE OR MORE OF PRESSURE, ABSOLUTE PRESSURE, DIFFERENTIAL PRESSURE, TEMPERATURE, LEVEL AND FLOW, RESISTANCE THERMOMETERS, THERMOCOUPLERS, THERMOSTATS, PROBES FOR MEASURING VELOCITY AND FLOW RATES OF GASSES A...