Acoustic conduits; Data processing apparatus; Data processing equipment, namely, couplers; Earphones; Educational apparatus, namely, blocks used as teaching aids for modeling chemical compounds and visualization of math concepts; Headphones; Radio receivers; Wireless headsets for smartphones; Wireless transmitters and receivers

'acoust':1 'aid':19 'apparatus':5,13 'block':15 'chemic':22 'compound':23 'concept':28 'conduit':2 'coupler':10 'data':3,6 'earphon':11 'educ':12 'equip':8 'headphon':29 'headset':33 'math':27 'model':21 'name':9,14 'process':4,7 'radio':30 'receiv':31,39 'smartphon':35 'teach':18 'transmitt':37 'use':16 'visual':25 'wireless':32,36

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