About: http://webisa.webdatacommons.org/307899093

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	This division and proportioning is made, for one reason, to accommodate the head and trunk, thighs, and lower legs of the user on the three sections, and the actual dimensions are such as to adapt the table to persons of usual height.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com