About: http://webisa.webdatacommons.org/215765722

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 biggest problem is turning the disc at the exact speed of the scanning disc at the transmitting end, and keeping the two in perfect synchronism.
http://www.w3.org/ns/prov#wasQuotedFrom	modernmechanix.com