Standard-unit measuring machines and apparatus, namely, temperature indicators, gas meters, water meters, capacity measures for measurement of temperature; standard-unit measuring machines and apparatus used for measuring gas quantity, liquid dosage, and dimensions, namely, gas flow meters, water meters, oil meters, level indicators, sprit levels; derived-unit measuring machines and apparatus, namely, high pressure manometers, level indicators, spirit levels, acoustic meters, tachometers, accelerometers, refractometers, luminous flux meters, actinometers, altimeters, hygrometers, illuminometers, vibration meters, noise meters, logs, accelerometers, calorimeters, viscosimeters, concentration meters; gravimeters for measurement of pressure, liquid-level, pitch, rotation, accelerated velocity, refraction, luminous flux, luminance, altitude, humidity, illuminance, vibration, noise, log, speed, calorie, viscosity, concentration, specific gravity; precision measuring machines and instruments, namely, angle gauges, spherometers, inclinometers, interferometers, straightness testing machines and instruments, profile projectors, graduation checkers, calibration checkers, length measuring gauges, screw-thread measuring machines and instruments, comparators, surface roughness testing machines and instruments, flatness testing machines and instruments for measurement of angle, sphericity, gradient, interferogram, straightness, projection, calibration, length, screw-thread, comparators, surface roughness, flatness; automatic adjusting/regulating machines and instruments, namely, automatic pressure control machines and instruments, automatic liquid-flow control machines and instruments, automatic fluid-composition control machines and instruments, automatic liquid-level control machines and instruments, automatic temperature control machines and instruments, automatic combustion control machines and instruments, automatic vacuum control machines and instruments, automatic calorie control machines and instruments, material testing machines and instruments for testing the strength of metallic materials, rubber, concrete, cement, textile, plastic, and lumber; material testing machines and instruments for testing the hardness of metallic materials, rubber, concrete, cement, textile, plastic, and lumber; material testing machines and instruments for compression testing of metallic materials; laboratory apparatus and instruments, namely, air-gas producers, constant temperature incubators, constant humidity incubators, glassware for scientific experiments in laboratories, porcelain ware for scientific experiments in laboratories, furnaces for laboratory experiments; electric switches, electric relays, circuit breakers, power controllers, current rectifiers, electric connectors, electric circuit closers, condensers, capacitors, electric resistors, local switches, power distributing boxes, switchboards, fuses, lightning arresters, electric transformers, induction voltage regulators, electric reactors; rotary converters; phase modifiers, namely, synchronous capacitors; asynchronous capacitors; batteries and dry cells; electric or magnetic meters and testers, namely, phase indicators, oscillographs, oscilloscopes, circuit testers, antenna parameter measuring apparatus, metal detectors for industrial and military purposes, electric leakage detectors, magnetometers, frequency meters, vacuum tube characteristic testers, watt hour meters, resistance measuring instruments, voltmeters, wavemeters, ammeters, wattmeters, oscillators, capacity measures; electric wires and cables; photographic instruments and apparatus, namely, range finders for cameras, exposure meters, light meters; spectacles, namely, eyeglasses and goggles for sports, namely, skiing and swimming; life saving apparatus and equipment, namely, life preservers and life-rafts; radar machines and apparatus, remote control telemetering machines and instruments; metronomes; magnetic object detectors, echo sounders, ultrasonic sensors; ozonisers in the nature of ozonators; electrolysers in the nature of electrolytic cells; simulators for the steering and control of vehicles, namely, vehicle drive training simulators; electric flat irons; electric hair-curlers; electric buzzers; vehicle breakdown warning triangles; luminous or mechanical road signs; luminous or mechanical railway signals; fire alarms; gas alarms; anti-theft warning apparatus for motor cars; gloves for protection against accidents; fire extinguishers; fire hydrants; fire hose nozzles; sprinkler systems for fire protection; fire boats; fire engines; cigar lighters for automobiles; protective helmets; fireproof garments; dust masks; gas masks; welding masks; magnetic cores; resistance wires; electrodes; exposed cinematographic films; exposed slide films; slide film mounts; gasoline station equipment, namely, fuel dispensing pumps for service stations, gasoline leak detectors, metered gasoline pumps; automatic vending machines; coin-operated gates for car parks or parking lots; cash registers; coin counting or sorting machines; ergographs for scientific and research purposes; photocopying machines; calculators; time and date stamping machines; time clocks in the nature of time recording devices; electric calculators; voting machines; billing machines, namely, automated billing machines for processing accounting information; slide-rules; weight belts for scuba diving; inflatable swimming floats in the nature of protection and safety apparatus, namely, inflatable flotation devices; air tanks for scuba diving; regulators for use in scuba diving; diving suits, diving vests, diving masks, goggles for diving, nose clips for swimming or diving, breathing apparatus for underwater swimming, ear plugs for diving, gloves for divers, buoyancy compensators for diving; electric arc welding machines; electric metal cutting machines by arc, gas or plasma; electric arc welders, ultrasonic welders, gas welding machines; consumer games, namely, computer game consoles for use with an external display screen or monitor; egg-candlers; electric door openers; apparatus for arcade games adapted for use with an external display screen or monitor, namely, video game consoles for use with an external display screen or monitor