air ventilation and filtering systems comprising ventilating fans and fan blowers for commercial and industrial use for separating airborne waste materials from air, and metal ducts therefore sold as a unit

'air':1,23 'airborn':19 'blower':11 'commerci':13 'compris':6 'duct':26 'fan':8,10 'filter':4 'industri':15 'materi':21 'metal':25 'separ':18 'sold':28 'system':5 'therefor':27 'unit':31 'use':16 'ventil':2,7 'wast':20

materials handling systems comprising material conveyors and separating machines for the removal of airborne waste materials from conveying air

'air':19 'airborn':14 'compris':4 'convey':18 'conveyor':6 'handl':2 'machin':9 'materi':1,5,16 'remov':12 'separ':8 'system':3 'wast':15

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