<http://webisa.webdatacommons.org/326854589> <http://www.w3.org/ns/prov#wasQuotedFrom> <freepatentsonline.com> . <http://webisa.webdatacommons.org/326854589> <http://www.w3.org/ns/prov#value> "The gaseous products can be sewer gases or other unpleasant fumes that may be noxious or hazardous if allowed to back up within the building.It is well known to incorporate a vent pipe into a building by extending a pipe, made of a material such as acrylonitrile butadiene styrene (ABS) or polyvinyl chloride (PVC), from the waste water system to the exterior of the building." . <http://webisa.webdatacommons.org/prov/141240648> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/326854589> . <http://webisa.webdatacommons.org/prov/329943054> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/326854589> . <http://webisa.webdatacommons.org/326854589> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> .