About: http://webisa.webdatacommons.org/87603245

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	U.S. Pat. No. 3,163,588 (Shortt), which issued on Dec. 29, 1964, briefly suggests that a through hole surface may be rendered conductive prior to electroplating by applying a paint or ink containing a substance such as graphite.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com