About: http://webisa.webdatacommons.org/150168175

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	FIGS. 4A and 4B show alternative embodiments of the apparatus shown in FIG. 2, including means for compensating for variations in the intensity of the light source;
http://www.w3.org/ns/prov#wasQuotedFrom	google.com