About: http://webisa.webdatacommons.org/315046878

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 a blocked frog the point of space between the rails, at the point where the car is switched from one track to another, is filled with wood or other material, so that the foot will not be held.
http://www.w3.org/ns/prov#wasQuotedFrom	openjurist.org