The patent holder from the karaoke equipment is Roberto del Rosario, that's in the Philippines. He made the karaoke's sing-along process in 1975 which is regarded as the sole holder of the patent for a karaoke process on the earth.[20] Later developments[edit] 5x electronic zoom directional audio dual-screen help 12 https://xn--939au0g6rj1ue34n9rrf5c.online/