metal rails and metal sleepers for railways; railway ties of metal; metal dampers for railways lines and tracks; and metal railway switches

'damper':13 'line':16 'metal':1,4,11,12,20 'rail':2 'railway':7,8,15,21 'sleeper':5 'switch':22 'tie':9 'track':18

research and development for others concerning the constructions, repair and installation of railway lines, tracks, dampers, switches and sleepers

'concern':6 'construct':8 'damper':16 'develop':3 'instal':11 'line':14 'other':5 'railway':13 'repair':9 'research':1 'sleeper':19 'switch':17 'track':15

repair and installation of railway lines, tracks, dampers, switches, and sleepers

'damper':8 'instal':3 'line':6 'railway':5 'repair':1 'sleeper':11 'switch':9 'track':7

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