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Calculating machines; Calculating scales; Calculators and calculating machines; Computer keyboard controllers; Computer keyboard keycaps; Computer keyboards; Keyboard and print out apparatus for use with computers; Computer keyboard covers; Microscope condensers; Microscope objectives; Mouse pads; Disposable computer keyboard covers; Electronic calculators; Pocket calculators; Radio receivers and transmitters for monitoring and controlling light emitting diodes in a network of street lights and for processing emergency signals transmitted to individual street lights; Rotating lights; Traffic-light apparatus