About: http://webisa.webdatacommons.org/17596038

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	Moreover, as shown in the figure, the envelope need not be completely closed, but may be provided with openings, such as openings 3.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com