About: http://webisa.webdatacommons.org/312475525

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	The present invention is a development of my U.S. Pat. Nos. 5,170,190 and 5,216,454 which disclose divers' masks having optical prisms for supplementing a diver's field of vision.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com