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- ....wikipedia.org/wiki/Karaoke#Second_patent_case It was awarded in favour of Roberto del Rosario]</span>5 KB (717 words) - 17:50, 18 April 2011
- ...t prolific Filipino inventor. Besides his famous Karaoke Sing Along System Roberto del Rosario has also invented:9 KB (1,373 words) - 00:23, 7 March 2011
- Fundada por el banquero Roberto Zamora y por su esposa9 KB (1,616 words) - 11:10, 17 April 2012