| http://www.w3.org/ns/prov#value | - North American Indians chewed spruce gum.The first manufacturing patent for chewing gum was issued in 1869 for a natural gum, chicle, derived from the Sopadilla tree, indigenous to Central America.Chewing gum sold today is a mixture of natural and synthetic gums and resins, with added color and flavor sweetened with corn syrup and sugar.The medical literature contains very little information about
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