Visual education apparatus, components thereof, and accessories therefor, namely, teaching machines, documentary matter containing instructional material for use with such teaching machines, instructional films for use with such teaching machines, phonograph records for instructional use, and books.
Visual education apparatus, components thereof, and accessories therefor, namely, teaching machines, documentary matter containing instructional material for use with such teaching machines, instructional films for use with such teaching machines, phonograph records for instructional use, and books.
Visual education apparatus, components thereof, and accessories theref...
