Vegetable substances in the nature of filtering materials made from rice hulls for water filtration

'filter':7 'filtrat':15 'hull':12 'made':9 'materi':8 'natur':5 'rice':11 'substanc':2 'veget':1 'water':14

water filters; filters made from rice hulls and other materials for water filtration; air filters for residential, industrial or commercial installations; air filters for domestics use; and filters for air conditioning

'air':14,22,30 'commerci':20 'condit':31 'domest':25 'filter':2,3,15,23,28 'filtrat':13 'hull':7 'industri':18 'instal':21 'made':4 'materi':10 'residenti':17 'rice':6 'use':26 'water':1,12

901X

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