About: http://webisa.webdatacommons.org/252374975

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	The aperture may be adjustable by means of a clamp 263 and also provided with a seal such as a gasket or skirt which may be formed, for example, from a section of rubber tubing.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com