Branching pipes, not of metal; Drain pipes, not of metal; Ducts, not of metal, for ventilating and air-conditioning installations; Gutter pipes, not of metal; Pipes of cement, earthenware or sandstone; Plastic conduit for irrigation; Rigid pipes, not of metal, for building; Sandstone pipes; Sewer pipes, not of metal; Water-pipes, not of metal

'air':19 'air-condit':18 'branch':1 'build':43 'cement':29 'condit':20 'conduit':34 'drain':6 'duct':11 'earthenwar':30 'gutter':22 'instal':21 'irrig':36 'metal':5,10,14,26,41,50,56 'pipe':2,7,23,27,38,45,47,53 'plastic':33 'rigid':37 'sandston':32,44 'sewer':46 'ventil':16 'water':52 'water-pip':51

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