About: http://webisa.webdatacommons.org/277293718

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	In the prior state of the art, drilling heads are large in size, particularly in height, and are cumbersome and ineicient in operation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com