Ahead of their time: 9 technologies that came too soon

Sometimes you build it, and they end up not coming.
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The tech industry has seen more than its share of products and services that are ahead of their time. All of them flopped, but all of them also influenced the industry. This list should serve as a warning to those who think that being the first to think of something will lead to any easy road to success.

See also: 10 'great' tech products that really weren't

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