About: http://webisa.webdatacommons.org/166942220

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	The conventional ultrasonic coordinates input devices use signals such as driving pulses generated by an ultrasonic input pen, which are clear in rising, as a starter for measuring the time of propagation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com