Indoor horizontal mini trivision sign 1.Full set digital control equipment 2.CE,ISO9000, ... .CE,ISO9000,National Invention Patent Indoor horizontal mini trivision sign ,tri-vision display,trivision billboard, trivision board The specification: External frame: 136-145mm, ... 20 years, collects merits of all manufacturers.B Honghai trivision display composes of divers of triangular prisms made by special ...