11.52.00 Audio-Visual Equipment
11.52.13.16 Portable Projection Screens
11.52.13 Projection Screens 11.52.13.13 Fixed Projection Screens 11.52.13.16 Portable Projection Screens 11.52.13.19 Rear Projection Screens 11.52.16 Projectors 11.52.16.13 Movie Projectors 11.52.16.16 Slide Projectors 11.52.16.19 Overhead Projectors 11.52.16.23 Opaque Projectors 11.52.16.26 Video Projectors 11.52.19 Players and Recorders 11.52.23 Audio-Visual Equipment Supports 11.52.33 Interactive Displays