Virgilio Sangutan, president of Davao Inventors Association announces that they are calling for entries for the Regional Invention Contests and Exhibits at a big mall in Matina on October 1-3. (Ace R.Morandante/davaotoday.com)

Virgilio Sangutan, president of Davao Inventors Association announces that they are calling for entries for the Regional Invention Contests and Exhibits at a big mall in Matina on October 1-3. (Ace R.Morandante/davaotoday.com)

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