The patent holder from the karaoke equipment is Roberto del Rosario, that is from the Philippines. He formulated the karaoke's sing-alongside system in 1975 and is also identified as the sole holder of a patent for any karaoke process on earth.[20] Afterwards developments[edit] ● Operates on RoomOS to get a https://xn--939au0g6rj1ue34n9rrf5c.online/