infrared systems comprised of transmitters and receivers; distribution amplifiers; power amplifiers; radio frequency devices; speakers; speaker selectors and volume controls; power controllers and electrical switches; plates and mechanical connectors therefor

'amplifi':9,11 'compris':3 'connector':29 'control':20,22 'devic':14 'distribut':8 'electr':24 'frequenc':13 'infrar':1 'mechan':28 'plate':26 'power':10,21 'radio':12 'receiv':7 'selector':17 'speaker':15,16 'switch':25 'system':2 'therefor':30 'transmitt':5 'volum':19

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