Liquid proportioning and metering instruments and apparatus, namely, chemical and liquid proportioners in the industrial cleaning fields for mixing detergents and chemicals with a water stream in non-medical, non-dental and non-veterinary applications; liquid handling equipment, namely, automatic butterfly valves, automatic control valves; automatic valves; high frequency electronic circuit boards and microwave integrated circuits for use in microwave frequency applications; [ capacitors for microwave equipment;] ceramic packaging for use in the further manufacture of integrated circuits and electronic devices; pressure gauges; automatic valves, namely, hydraulic, pneumatic and solenoid valves and control valves for aircraft and submarines; laser printers; laser scanners for industrial inspection; laser markers; electromechanical switches; [ electrical, electronic and radio-controlled switches for crane systems; computerized color control apparatus for printing presses; x-y scanning densitometers; computer hardware and software for monitoring, reporting and analyzing pressroom operations; ] computer printers; electrical controls for ink jet printers; radio frequency and microwave filters; electronic circuit components and electromagnetic structures for selective frequency control within the electromagnetic spectrum, namely, crystal-controlled oscillator circuits, transducers and electromechanical switches, coaxial and wave guide switches and telecommunications power signal routing switches; electronic microwave transmitters and receivers; liquid level gauges; liquid level controls and alarms for tanks, cars, trucks, barges and stationary and intermodal tanks; [ capacitors; computer operating software for use with electronic component assembly production lines; control and integration software for pressroom automation; ] electronic controllers controlling production of oil and gas well installations; automatic control valves and liquid level controllers; automatic industrial check valves; gas flow gauges; [ electronic products using microprocessors, namely, ATMs, screen printers, semiconductor bare boards testers; ] electronic measuring, reference and calibration apparatus and instruments for use in sensing and measuring density, flow, pressure, force, torque, weight, temperature and inertial parameters, namely, measuring densitometers and quartz pressure transducers to measure pressure and temperature in oil and gas exploration and production; pressure sensing apparatus for use in liquid flow lines; crystal oscillators; trash container fullness monitors; ink jet printers; computerized mechanical measuring devices for identifying and analyzing structural damage to vehicles; automatic metered dispensers for cleaning chemicals; programmable pump dispensing unit for commercial dishwasher and laundry applications; automatic laundry and dish detergent dispenser; automatic dispensers for proportioning, dispensing and pumping chemicals and cleaning solvents