[ fume exhauster and blowers used for industrial cleaning; ] Fume extractors and filters therefor for welding and industrial use; downdraft tables and filters therefor for welding and industrial use [ ; extraction arms used with welding fume extractors for welding and industrial shop cleaning ]

'arm':30 'blower':4 'clean':8,41 'downdraft':19 'exhaust':2 'extract':29 'extractor':10,35 'filter':12,22 'fume':1,9,34 'industri':7,17,27,39 'shop':40 'tabl':20 'therefor':13,23 'use':5,18,28,31 'weld':15,25,33,37

pressure switches and sensors as parts of machines, namely, switches and sensors used to automatically turn a fume extractor on and off when it detects a welding arc

'arc':28 'automat':15 'detect':25 'extractor':19 'fume':18 'machin':8 'name':9 'part':6 'pressur':1 'sensor':4,12 'switch':2,10 'turn':16 'use':13 'weld':27

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