Educational apparatus, namely, semi-occluded vocal tract exercise devices used as a teaching aid in vocal training and music instruction

'aid':15 'apparatus':2 'devic':10 'educ':1 'exercis':9 'instruct':21 'music':20 'name':3 'occlud':6 'semi':5 'semi-occlud':4 'teach':14 'tract':8 'train':18 'use':11 'vocal':7,17

Physical exercise apparatus in the nature of semi-occluded vocal tract exercise device for strengthening and conditioning of vocal folds and vocal production musculature

'apparatus':3 'condit':18 'devic':14 'exercis':2,13 'fold':21 'musculatur':25 'natur':6 'occlud':10 'physic':1 'product':24 'semi':9 'semi-occlud':8 'strengthen':16 'tract':12 'vocal':11,20,23

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