Audio testing apparatus; Audio cable testers; Continuity testers; Mains testers (Electric -); Phase checkers; Sound level meters; Acoustic meters; Decibel meters; Measuring apparatus and instruments; Digital measuring apparatus; Audio apparatus; Sound samplers; Sound processors; Control apparatus for audio signals; Audio signal range restorers

Computer programming; Computer software design; Computer system analysis; Computer system design; Computer software consultancy; Computer virus protection services; Computer technology consultancy; Computer security consultancy; Creating and maintaining web sites for others; Creating and designing website-based indexes of information for others using information technology; Data security consultancy; Data encryption services; Electronic data storage; Electronic monitoring of personally identi...