Apparatus for ventilating, namely, exhaust air filtration devices and heat recovery devices in the nature of heat exchangers not being parts of machines, exhaust air coolers, and heat pumps for industrial processes and machinery, electrostatic filters and ionization devices for treatment of air from industrial processes and machinery

'air':6,25,43 'apparatus':1 'cooler':26 'devic':8,12,39 'electrostat':35 'exchang':18 'exhaust':5,24 'filter':36 'filtrat':7 'heat':10,17,28 'industri':31,45 'ioniz':38 'machin':23 'machineri':34,48 'name':4 'natur':15 'part':21 'process':32,46 'pump':29 'recoveri':11 'treatment':41 'ventil':3

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