About: http://webisa.webdatacommons.org/338529886

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	This invention concerns an apparatus for detecting the fact that a moving ball or other game piece has crossed a boundary or play determinative line on a playing field.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com