About: http://webisa.webdatacommons.org/1365146

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	speed equal to (m.times.n.+-.l) times said first speed, where n is an integer other than zero, l=0.5 when said pair of heads comprise said double azimuth head assembly and l=0.25 when said heads are angularly separated by 180.degree..
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com