Audio-visual materials
Audio-visual materialsmeans: Films, filmstrips and microfilm in exposed and developed negative form, or in positive form, viz., masters or prints, teletranscriptions, kinescopes, videotape; (2) electronic sound recordings and sound/picture recordings of all types and forms or pressings and transfers thereform; (3) slides and transparencies; moving and static models, wallcharts, globes, maps and posters.