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Apple introduces Apple DOS 3.1, the first operating system for the Apple computers
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Apple introduces System 1,ths system probly has more memory
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Apple introduces System 2.
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Apple introduces System 3.
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Apple introduces System 4.
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Apple introduces System 6.
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Apple introduces System 7 operating system
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Apple allows other computer companies to clone its computer by announcing its licensed the Macintosh operating system rights to Radius.
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Apple introduces Mac OS 8.
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Apple buys NeXT Software Inc. for $400 million and acquires Steve Jobs, Apples cofounder, as a consultant.
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Apple introduces Mac OS 9.
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Apple introduces Mac OS X 10.1 code named Puma and becomes available on September 25, 2001.
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Apple introduces Mac OS X 10.0 code named Cheetah and becomes available
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Apple introduces Mac OS X 10.2 code named Jaguar and becomes available
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Apple introduces Mac OS X 10.3 code named Panther .
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Apple introduces Mac OS X 10.4 code named Tiger at the WWDC
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Apple introduces Mac OS X 10.5 code named Leopard
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Apple introduces Mac OS X 10.6 code named Snow Leopard and MobileMe at the WWDC .