About: http://webisa.webdatacommons.org/426866397

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	Optionally the reference test comb signal can be further refined to make its carriers more easily distinguishable from other signals and noise by gating the comb on and off at a rate such as 1 kHz.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca