About: http://webisa.webdatacommons.org/215729073

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 oscillation frequency may also vary considerably, depending mainly on the size, shape, and characteristics of the exciter and pick-up structure.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com