About: http://webisa.webdatacommons.org/133275249

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	Normally, the u-shaped spring is designed to vibrate at resonant frequency, in the x-y plane at a relatively higher frequency, for example 400 Hz., than the planar spring, which might be at 50 Hz.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es