About: http://webisa.webdatacommons.org/296999128

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	These flanges are provided at their center with elongated narrow slots 2c and 2d, respectively, extending up through these flanges, there being a shoulder inwardly of each such slot as shown in FIG. 11.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com