Noise cancelling/reduction headphones; anti-noise sound apparatus and equipment; apparatus, instruments and materials for transmitting and/or receiving and/or recording sound and/or data; microphones; speakers; sound reproduction apparatus; sensors/detectors; transmitters of sound waves; portable audio digital electronic devices; audio head sets and ear pieces

'and/or':17,19,22 'anti':5 'anti-nois':4 'apparatus':8,11,28 'audio':35,39 'cancelling/reduction':2 'data':23 'devic':38 'digit':36 'ear':43 'electron':37 'equip':10 'head':40 'headphon':3 'instrument':12 'materi':14 'microphon':24 'nois':1,6 'piec':44 'portabl':34 'receiv':18 'record':20 'reproduct':27 'sensors/detectors':29 'set':41 'sound':7,21,26,32 'speaker':25 'transmit':16 'transmitt':30 'wave':33

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