About: http://webisa.webdatacommons.org/313972235

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 a device such as a pen recorder it is desirable to have the amplitude of vibration independent of frequency and so it is the usual practice to drive the recorder from an amplifier
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr