Automatic inlet control valves for reciprocating air compressors; Automatic liquid-flow control machines and instruments; Automatic liquid-level control machines and instruments; Automatic pressure control machines and instruments; Automatic valves; Computer software for application and database integration; Computer software for computer system and application development, deployment and management; Computer software for providing an online database in the field of transaction processing to upload transactional data, provide statistical analysis, and produce notifications and reports; Control valves for regulating the flow of gases and liquids; Electric valve actuators; Electro acoustic transducers; Electronic valves for controlling gas or fluids; High pressure manometers; Instruments and apparatus for controlling electric current, namely, electrical controllers for magnetic bearing control; Instruments for detecting and measuring two-dimensional distribution of force and pressure; Instruments for measuring length; Measuring instrumentation and apparatus, namely digitizers; Portable electronic recorder for measuring and recording multiple voltage, current and thermocouple readings from various transducers; Pressure control equipment, namely, blowout preventers; Pressure gauges; Pressure indicating plugs for valves; Pressure relief valves for pipes and conduits; Pressure sensors; Safety valves for flow shutoff in well construction; Scientific measuring instruments, namely conductivity meters; Solenoid valves ; Tool measuring instruments; Tyre-pressure measurers; Unloading check valves for the outlets of air compressors; Wave reflectors for acoustic speakers, lighting apparatus, and air flow devices