9 AUDIO VISUAL TEACHING MATERIALS AND AIDS, NAMELY-RECORDING AND SLIDE PROJECTORS, TAPE RECORDERS, RECORDS, REEL TO REEL TAPES, CASSETTES, TRANSPARENCIES, FILM STRIPS, SLIDES AND RELATED ITEMS NAMELY, PRINTED MATERIALS, TEACHERS' GUIDES, RECORD JACKETS, TAPE BOXES, SPIRIT MASTERS FOR DUPLICATION, AND PACKAGING MATERIALS SOLD AS A UNIT FOR SCHOOLS AND OTHER EDUCATIONAL INSTITUTIONS