Pure- An example of Pure Monopoly is PSE&G because they control their entire industry respectively.
Government- An example of Government Monopoly is the U.S. Postal Service because it is the sole provider of that specific good/service.
Technological- An example of Technological Monopoly is microsoft because of the product sold and the fact that they are the only producer of their product.
Geographic- An example of Geographic Monopoly is Florida Oranges because based on the climate, environment and available resources in that specific state, florida is the only place that can grow there respective fruit.