DEVICES FOR RECORDING, TRANSMISSION AND REPRODUCTION OF PRESSURE AND TEMPERATURE DATA AND INFORMATION, NAMELY, GAUGES, PRESSURE INDICATORS, DIFFERENTIAL PRESSURE INDICATORS, AND INDICATORS FOR MEASURING THE CONCENTRATION OF GAS IN LIQUIDS; DATA PROCESSING EQUIPMENT, NAMELY, MICROPROCESSOR AND COMPUTER BASED CONTROLS FOR CALIBRATION, MEASUREMENT, AND CALCULATION OF PRESSURES AND TEMPERATURES; PRESSURE SENSING DEVICES, NAMELY, PIEZOELECTRIC SENSORS, STRAIN GAUGE SENSORS, AND CAPACITIVE SENSORS FOR PRESSURE AND TEMPERATURE; PRESSURE MEASURING EQUIPMENT FOR CALIBRATING, NAMELY, MICROPROCESSOR AND COMPUTER BASED CALIBRATORS FOR HIGH, MEDIUM, AND LOW PRESSURE RANGES, PRESSURE RANGES, CALIBRATION PUMPS AND CALIBRATION HEATERS; DISPLAY EQUIPMENT, NAMELY, DIGITAL DISPLAY METERS; DATA STORAGE EQUIPMENT, NAMELY, MICROPROCESSOR AND COMPUTER CONTROLLED STORAGE HARDWARE AND BLANK DISCS AND MAGNETIC TAPES THEREFOR; COMPUTER SOFTWARE FOR USE IN DATABASE MANAGEMENT, FOR USE AS A SPREADSHEET, FOR WORD PROCESSING, IN THE FIELD OF PRESSURE AND TEMPERATURE SENSING, CONTROLLING RECORDING AND CALIBRATION; PROGRAMMING EQUIPMENT, NAMELY, COMPUTER AND MICROPROCESSOR DRIVEN PROGRAMS FOR MANAGEMENT AND CONTROL OF PRESSURES AND TEMPERATURES FOR PROCESS CONTROL SYSTEMS IN MANUFACTURING OPERATIONS; SIGNAL AMPLIFYING EQUIPMENT, NAMELY, DEVICES FOR RECEIVING, AMPLIFYING AND TRANSMITTING SIGNALS RECEIVED FROM PRESSURE AND TEMPERATURE SENSORS, GAS DENSITY METERS, AND CONSUMPTION RATE SENSORS; ELECTRICAL CONTROL EQUIPMENT, NAMELY, MICROPROCESSOR AND COMPUTER BASED CONTROLS FOR PRESSURE, CONSUMPTION RATE, AND FILTRATION; TEST EQUIPMENT FOR THE EXAMINATION OF OTHER ELECTRICAL EQUIPMENT, NAMELY, PRESSURE AND TEMPERATURE SENSORS, AND GAS DENSITY METERS FOR MEASURING GAS-FILLED ELECTRICAL SWITCHES