Heat exchangers being parts of machines; pipe heat exchangers for use in industry being parts of machines

'exchang':2,9 'heat':1,8 'industri':13 'machin':6,17 'part':4,15 'pipe':7 'use':11

Heat exchangers, other than parts of machines; pipe heat exchangers for use in industry, not being parts of machines; heat exchangers for chemical processing

'chemic':23 'exchang':2,10,21 'heat':1,9,20 'industri':14 'machin':7,19 'part':5,17 'pipe':8 'process':24 'use':12

Installation and repair of heat exchangers

'exchang':6 'heat':5 'instal':1 'repair':3

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