Establishments primarily engaged in manufacturing: (1) photographic apparatus, equipment, parts, attachments, and accessories, such as still and motion picture camera and projection apparatus; photocopy and microfilm equipment; blueprinting and diazotype (white printing) apparatus and equipment; and other photographic equipment; and (2) sensitized film, paper, cloth, and plates, and prepared photographic chemicals for use therewith. Establishments primarily engaged in manufacturing photographic paper stock (unsensitized), and paper mats, mounts, easels, and folders for photographic use, are classified in Major Group 26; those manufacturing photographic lenses are classified in Industry 3827; those manufacturing photographic glass are classified in Major Group 32; those manufacturing chemicals for technical purposes, not specifically prepared and packaged for use in photography, are classified in Major Group 28; and those manufacturing photographic flash, flood, enlarger, and projection lamp bulbs are classified in Industry 3641.