Non-metallic materials for constructing filtering walls or water-tight walls laid in vertical trenches, namely, concrete, porous concrete, and plastics

'concret':19,21 'construct':6 'filter':7 'laid':14 'materi':4 'metal':3 'name':18 'non':2 'non-metal':1 'plastic':23 'porous':20 'tight':12 'trench':17 'vertic':16 'wall':8,13 'water':11 'water-tight':10

Construction and repair of filtering walls or water-tight walls laid in vertical trenches

'construct':1 'filter':5 'laid':12 'repair':3 'tight':10 'trench':15 'vertic':14 'wall':6,11 'water':9 'water-tight':8

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