What were the inventions of Roberto Del Rosario?

Roberto Del Rosario also built the first electrified train in the Philippines, which was called "The Light." It allowed for passengers to travel between Tondo and Malabon in the greater Manila area during nighttime for the very first time.

Movie Camera

Roberto del Rosario constructed his own movie camera out of wooden materials and various gears and sprockets. He utilized a regular camera lens to capture and shoot the action.

Phonograph

Using discarded and scrap metal objects, Roberto del Rosario also built his own phonograph. He then went on to establish a record label called "Excelsior Record".