tubular liners of polymeric materials, such as polyethylene for the repair or reconstruction of existing water and gas mains and industrial pipelines, by reducing the diameter, installing and expanding the liner against the internal walls of the existing conduit

'conduit':39 'diamet':26 'exist':15,38 'expand':29 'gas':18 'industri':21 'instal':27 'intern':34 'liner':2,31 'main':19 'materi':5 'pipelin':22 'polyethylen':8 'polymer':4 'reconstruct':13 'reduc':24 'repair':11 'tubular':1 'wall':35 'water':16

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