Who is the patent holder of the karaoke system? Which country is #1 from? Who patented the turtle power tiller? Which country is #3 from? Is #2 the same as #4?
Karaoke
Roberto L. del Rosario holds the patent for the karaoke system del Rosario is Filipino Magdalena Smith Villaruz patented the turtle power tiller Villaruz is Filipino 
form of entertainment involving singing to recorded music
Were karaoke and the turtle power tiller patented in the same country?