About: http://webisa.webdatacommons.org/378296809

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 second aspect of the invention, a waveguide for radiating sound waves, has segments of length approximately equal to where l is the effective length of said waveguide and n is a positive integer.
http://www.w3.org/ns/prov#wasQuotedFrom	radaris.com