The patent holder with the karaoke device is Roberto del Rosario, that's through the Philippines. He produced the karaoke's sing-alongside method in 1975 which is recognized as the only real holder of a patent for just a karaoke method in the world.[20] Later developments[edit] ● Runs on RoomOS for any https://xn--939au0g6rj1ue34n9rrf5c.online/