... free3.CE,ISO9000,National Invention Patent Square matrix trivision billboard ,tri-vision display,trivision billboard, trivision board The specification ... 2.0mmWidth of triangle prism: 126mm×3 sides Square matrix trivision billboardImage flipping time : each face 6-12 ... square meterDriving: double-gear steps driving system Honghai Tri-vision display peculiar techinique advantages: A Hong Hai has almost ...