Research and development concerning the construction, repair, and installation of railway lines, tracks, dampers, switches, and sleepers in the nature of crossties

'concern':4 'construct':6 'crossti':22 'damper':14 'develop':3 'instal':9 'line':12 'natur':20 'railway':11 'repair':7 'research':1 'sleeper':17 'switch':15 'track':13

Metal rails, sleepers in the nature of crossties, and points in the nature of areas of railway track which enable a train to move from one line to an adjoining line; metal railway switches; railway ties of metal; metal dampers for railway lines and tracks

'adjoin':30 'area':15 'crossti':8 'damper':40 'enabl':20 'line':27,31,43 'metal':1,32,38,39 'move':24 'natur':6,13 'one':26 'point':10 'rail':2 'railway':17,33,35,42 'sleeper':3 'switch':34 'tie':36 'track':18,45 'train':22

repair and installation of railway lines, tracks, dampers, switches, and sleepers in the nature of crossties

'crossti':16 'damper':8 'instal':3 'line':6 'natur':14 'railway':5 'repair':1 'sleeper':11 'switch':9 'track':7

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