About: http://webisa.webdatacommons.org/148027098

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	where d represents head-to-tape spacing, k is a constant, and ?? represents the recorded wavelength.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com