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In looking up these products, it seems the credit for the invention of both products goes to Omar Knedlik. Apparently, he had kept his sodas in the freezer and customers enjoyed the consistency when they purchased the partially frozen drinks. He came up with a machine that would keep the drinks in the semi frozen state. 7-11 bought the machine and gave it the Slurpee name for the sount that it made when imbibing. All this info is attributed to Wikipedia but some information seems to be conflicting