About: http://webisa.webdatacommons.org/45541243

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	FIG. 7, which is similar to FIG. 6, shows at 40 a sine wave which may be applied to the recording head 18 to produce a tag which will resonate at four times the natural frequency of the magnetostrictive element 12.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com