About: http://webisa.webdatacommons.org/374438308

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	A few of the putter training devices disclosed in the prior art are directed to correcting the problem of hitting the ball squarely, i.e. the ball must strike the face of the club perpendicular to the path of the club.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com