Instruments used for indicating, recording, controlling, liquid-level measuring, pressure controlling and pressure measuring, namely, turbine meters, ultrasonic flow meters, flow meters, electronic flow computers, gas chromatographs, flow measurement apparatus, gate valves, surge relief and flow control valves, and valve actuators and controls, gas and fluid flow equipment in the nature of metering orifices, orifice plates for metering or controlling the flow rate of liquids, and computers and computer software for controlling the aforementioned gas and fluid flow equipment; thermometers, temperature controlling instruments, namely, temperature controllers for gas and fluid flow; flow controlling instruments, namely, automatic liquid-flow control machines and instruments; pressure indicators in the nature of sensors and temperature recorders; apparatus, namely, computers, computer software and electronic modules for transmitting and recording fluid pressures corresponding to variable magnitudes, namely, temperature, flow, pressure, and liquid levels