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Carnegie Steel Company controlled all of the production of steel before being broke up by the federal government.

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The East Indies Company was a pure monopoly. They were the biggest firm of all time and took up the whole market by themselves.

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The aeronautic industry is an oligopoly. Boeing and Airbus make up most of the market share, and it is very hard to compete against them.

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The gasoline industry is a good form of an oligopoly. There are few companies that control the market, and it is hard to enter the industry

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Advertising is a monopolistic competition market type. As there are very large advertising firms, but it is easy to enter the market and gain a small market share.

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Smartphones are a good example of this market type. There is non-price competition, as the phones are very different from each other.

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Corn is a good example of pure competition. As the corn from firm to firm changes very little, there is little variance in the product being sold.

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Gold is a good example of pure competition. You can't create a different type of gold, there is only one element of gold.