Amplifiers; Anti-dazzle spectacles; Camcorders; Data processing equipment, namely, couplers; Distance measuring apparatus; Electric navigational instruments; Global positioning system (GPS); Luminous pointers; Radios; Satellite-aided navigation systems; Surveying instruments; Telephone receivers; Transmitters of electronic signals; Video recorders; Acoustic meters; Electric meters; Electrical transducer; Flow meters; Frequency meters; Level indicators; pH meters; Slide or photograph projectio...