chemical preparations in the nature of filtering materials that reduce automobile exhaust emissions and improve engine performance comprised of an absorbent material containing a catalyst in a porous nylon tube which is placed next to the air cleaner or incoming air stream of automobile and truck engines

'absorb':21 'air':37,41 'automobil':11,44 'catalyst':25 'chemic':1 'cleaner':38 'compris':18 'contain':23 'emiss':13 'engin':16,47 'exhaust':12 'filter':7 'improv':15 'incom':40 'materi':8,22 'natur':5 'next':34 'nylon':29 'perform':17 'place':33 'porous':28 'prepar':2 'reduc':10 'stream':42 'truck':46 'tube':30

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