About: http://webisa.webdatacommons.org/148029901

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 n is an integer equal to or greater than 0 (namely, n=0, 1, 2, . . . ), ??i is the wavelength of the ultrasonic beam, and F is the focal length (the thickness of the ink layer).
http://www.w3.org/ns/prov#wasQuotedFrom	google.com