About: http://webisa.webdatacommons.org/14864542

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	In the construction of sensing coils L1, L2 and L3, there is no need for magnetic cores or for external pole pieces, shells, or other magnetic guiding structures.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com