Color postcard showing the waiting area at the Kellogg Company tour building. Caption on back: A Trip Through Kellogg's Scheduled tours start from here every half hour form 9:00 a.m. to 4:00 p.m. daily, except Sundays and Holidays. While waiting, postcards which are available, may be sent to family and friends. Refreshments are served the guests after their trip through the plant. Kellogg's the Greatest name in Cereals.