9 Oil and gas well electrical and scientific equipment, namely, pressure regulators for oil and gas production; automatic liquid-flow control machines and instruments; automatic pressure control machines and instruments; control valves and chokes for regulating the flow of gases and liquids; electromechanical controls for use in oil and gas production; remote control telemetering machines and apparatus; remote controls for oil and gas well valves and chokes; audio-video receivers; computer software for use in the encryption and decryption of digital files, including video, text, binary, still images, graphics and multimedia files; interface circuits for video cameras; video cameras; video monitors; video transmission apparatus; computer programs for project management, production management, production optimization, component selection and integration, data and signal transmission, hardware operations and control, and analysis, manipulation, recognition, compression and decompression of data for oil and gas well electrical and scientific equipment; computers for data compression and decompression, data recognition and flow control; flow regulators for oil and gas production; batteries; sensors for the determination of temperature, pressure, flow rate and fluid composition