About: http://webisa.webdatacommons.org/119093768

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	y magnets l: distance between rotary axis and iron piece When ?? is small, (dH/dx)x=??l???K??l where K is a constant.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com