The Harry Winokur owned Mister Donut chain was was bought out by which large coffee and baked good chain in 1990?
Harry Winokur: Harry Winokur created the Mister Donut chain of doughnut shops. Harry Winokur:  The chain grew to include 550 shops before being bought out by the parent company of Dunkin' Donuts in 1990. Dunkin' Donuts:  Since its founding, the company has grown to become one of the largest coffee and baked goods chains in the world, with more than 12,000 restaurants in 36 countries.
Dunkin' Donuts