About: http://webisa.webdatacommons.org/421869098

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	In one form, the reduced area is an aperture, and the member of the gasket is a support that extends all the way through the flanges, thereby providing a secure engagement between the gasket and the case during operation.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com