air and gas compressors and their structural parts; flow reversing devices in the nature of inverting and deviating valves, being components of machines; power-operated electric pumps and power-operated blowers; exhaust silencers for engines; air filters being part of compressors and pumps, power-operated regenerative blowers

'air':1,38 'blower':33,50 'compon':21 'compressor':4,43 'deviat':18 'devic':11 'electr':27 'engin':37 'exhaust':34 'filter':39 'flow':9 'gas':3 'invert':16 'machin':23 'natur':14 'oper':26,32,48 'part':8,41 'power':25,31,47 'power-oper':24,30,46 'pump':28,45 'regen':49 'revers':10 'silenc':35 'structur':7 'valv':19

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