Postal zones were introduced in 1943, ZIP codes in 1963. Bar codes were introduced in 1973. Ingredient lists were required on most food labels beginning in 1938, and nutrition information has been required since 1973. Use floor mats inside and outside the doors. Current prices are recorded from antique shows, flea markets, sales and auctions throughout the United States.
Prices vary in different locations because of local economic conditions.
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