Ralston Purina Company, former American manufacturer of cereals, packaged foods, pet food, and livestock feed. This was the St. Joseph, MO location of Ralston Purina on 3rd & Messanie Street. Based on the cars in the parking lot I would estimate this photo to be circa 1950s.
A merger with Nestlé in December 2001 created Nestlé Purina PetCare Company.
