About: http://webisa.webdatacommons.org/146808544

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	Most preferably, the handle member is pivotally connected to the mop head by a positional universal joint 228, such as is shown and described in U.S. Pat. No. 3,850,533, the contents of which are incorporated herein by reference.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com