10 11 00 Visual Display Units 10 12 00 Display Cases 10 13 00 Directories 10 22 00 Partitions 10 22 24 Operable Partitions 10 11 13 Chalkboards 10 11 16 Markerboards 10 11 23 Tackboards 10 11 24 Bulletin Boards 10 11 40 Display Track System 10 22 19 Demountable Partitions 10 22 23 Portable Partitions 10 22 33 Accordion Folding Partitons