About: http://webisa.webdatacommons.org/21441447

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	That is, at the fastening time when the cover member and the corresponding member are fastened by a fastening device such as a bolt or the like, the small projection portions are attached along inner side walls of the annular groove.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com