Question: Who owns a company that manufactures frozen dessert machines, like soft serve machines, shake machines, slush machines, and batch freezers that is most known for being the soft serve machine used by a chain of soft serve ice cream and fast-food restaurants owned by International Dairy Queen, Inc?
{'answer': 'H C Duke & Son', 'supporting_facts': [['Electro Freeze', 0], ['Electro Freeze', 1], ['Dairy Queen', 0]]}