... Maintenance free 3.CE,ISO9000,National Invention Super High Mosaic Trivision Billboard1.Full set digital control equipment2.Maintenance ... free3.CE,ISO9000,National Invention PatentSuper High Mosaic Trivision Billboard, Arc trivision billboard,tri-vision displayThe specification ... for welding and gaps.5. 3mm,5mm,10mm temper glass ,and plywood for package ,avoid fragile in the ...