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Apple released the original Macintosh on January 24, 1984
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Microsoft introduced an operating environment named Windows
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Linux kernal, created by Linus Torvalds, while studying computer science at the University of Helsinki
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Apple announced the IPhone OS 1 at the IPhone keynote on January 9, 2007. It was released to the public alongside the original IPhone.
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Google Chrome's initial release date was 2008. It is a freeware web browser developed by Google.
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Android's first OS release had no codename, but all the other ones did. The current version release in August 2017 is named Oreo