About: http://webisa.webdatacommons.org/44778258

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	both calculators is a magic number on the printed circuit board (PCB): 13-04-709-479
http://www.w3.org/ns/prov#wasQuotedFrom	datamath.org