precast concrete structural components, namely arch-shaped units comprising vaults and inverts, adapted for assembly to form hydraulic structures, roadway and railway overpasses and underpasses, pedestrian passageways and underground chambers, and assemblies so formed

'adapt':14 'arch':7 'arch-shap':6 'assembl':16,33 'chamber':31 'compon':4 'compris':10 'concret':2 'form':18,35 'hydraul':19 'invert':13 'name':5 'overpass':24 'passageway':28 'pedestrian':27 'precast':1 'railway':23 'roadway':21 'shape':8 'structur':3,20 'underground':30 'underpass':26 'unit':9 'vault':11

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