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 [ densitomers ] * 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 [ desitometers ] * 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