Air curtains, namely, air blowers for room openings; air blades; air doors in the nature of high-powered electric air blowers for commercial use; environmental control apparatus, namely, air curtains in the nature of air blowers for promoting energy conservation, flying insect control, and efficiently separating rooms with two different temperatures

'air':1,4,9,11,21,30,36 'apparatus':28 'blade':10 'blower':5,22,37 'commerci':24 'conserv':41 'control':27,44 'curtain':2,31 'differ':51 'door':12 'effici':46 'electr':20 'energi':40 'environment':26 'fli':42 'high':18 'high-pow':17 'insect':43 'name':3,29 'natur':15,34 'open':8 'power':19 'promot':39 'room':7,48 'separ':47 'temperatur':52 'two':50 'use':25

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