Roberto del Rosario
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Who is Roberto del Rosario?
Roberto L. del Rosario is the president of the Trebel Music Corporation and the inventor of the Karaoke Sing Along System in 1975. He patented more than twenty inventions.
Between June 2, 1983 and 14 November 1986, he invented the audio equipment known as the sing-along system or karaoke. it was a two patents of improvements which is UM-5269 and UM-6237
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