(based on 1(a)) Maintenance of valves, expansion and dilation joints for use in the energy sector; (based on 44 (e)) maintenance and construction of valves, expansion and dilation joints for use in the energy sector

'1':3 '44':20 'base':1,18 'construct':24 'dilat':10,29 'e':21 'energi':16,35 'expans':8,27 'joint':11,30 'mainten':5,22 'sector':17,36 'use':13,32 'valv':7,26

(based on l(a)) Product research, namely the study of valves and design of valves for use by others in the energy sector; (based on 44 (e)) product research, namely, the study of valves

'44':26 'base':1,24 'design':13 'e':27 'energi':22 'l':3 'name':7,30 'other':19 'product':5,28 'research':6,29 'sector':23 'studi':9,32 'use':17 'valv':11,15,34

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