16 Printed instructional, educational, and teaching materials, in the field of industrial technology and processes, used for instructional purposes to teach vocational and engineering skills; printed educational materials for teaching purposes, except apparatus, in the field of industrial technology and processes, used for instructional purposes to teach vocational and engineering skills; printed teaching materials for educational purposes, except apparatus, in the field of industrial technology and processes, used for instructional purposes to teach vocational and engineering skills; printed instructional and teaching materials in the field of industrial technology and processes, used for instructional purposes to teach vocational and engineering skills