About: http://webisa.webdatacommons.org/151735547

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In a preferred embodiment, guide rails 13 include attached standoffs or grippers 16 that rest against a vertical support such as a tree, lamp post, pole or other vertical support (not shown in FIG. 1).
http://www.w3.org/ns/prov#wasQuotedFrom	google.com