About: http://webisa.webdatacommons.org/96413497

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	U.S. Pat. No. 3,802,692 describes apparatus for controlling the attitude of a knee joint, with the apparatus including a housing secured to the center section of an operating table to support the upper part of the leg being operated on.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com