This industry comprises establishments primarily engaged in one or more of the following: (1) salting, roasting, drying, cooking, or canning nuts; (2) processing grains or seeds into snacks; (3) manufacturing peanut butter; and (4) manufacturing potato chips, corn chips, popped popcorn, pretzels (except soft), pork rinds, and similar snacks. Cross-References. Establishments primarily engaged in-- ? Manufacturing crackers--are classified in Industry 31182, Cookie, Cracker, and Pasta Manufacturing; ? Manufacturing unpopped popcorn--are classified in Industry 31199, All Other Food Manufacturing; ? Manufacturing chocolate or candy-coated nuts and candy-covered popcorn--are classified in Industry Group 3113, Sugar and Confectionery Product Manufacturing; and ? Manufacturing soft pretzels--are classified in Industry 31181, Bread and Bakery Product Manufacturing.