The patent holder of your karaoke device is Roberto del Rosario, who is through the Philippines. He made the karaoke's sing-alongside system in 1975 and is acknowledged as the only real holder of a patent to get a karaoke technique on earth.[20] Afterwards developments[edit] This is the most important Artwork https://xn--939au0g6rj1ue34n9rrf5c.online/