Air filtering units; Safety accessories for gas pipes, namely, flashback arrestors and reverse flow check valves; Fibrous filtering media for general industrial use in the purification of air and industrial fluids; Separators for the cleaning and purification of air

'accessori':5 'air':1,28,39 'arrestor':11 'check':15 'clean':35 'fibrous':17 'filter':2,18 'flashback':10 'flow':14 'fluid':31 'gas':7 'general':21 'industri':22,30 'media':19 'name':9 'pipe':8 'purif':26,37 'revers':13 'safeti':4 'separ':32 'unit':3 'use':23 'valv':16

Electric, electronic, or electrochemical oxygen monitors and sensors for environmental use

'electr':1 'electrochem':4 'electron':2 'environment':10 'monitor':6 'oxygen':5 'sensor':8 'use':11

Aircraft repair; Repair and maintenance of aircraft; Repair, maintenance and modification of aircraft

'aircraft':1,7,13 'mainten':5,9 'modif':11 'repair':2,3,8

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