describe an invention that appeared before computer

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describe an invention that appeared before computer.

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2014-03-11 kukuluyuk 68.57 Check this speaking
2014-08-31 devabe2005 60.00 Check this speaking
2015-02-19 Fadlanmuzakki 55.00 Check this speaking
2015-05-14 wq.lee 78.00 Check this speaking
2014-08-01 devabe2005 60.00 Check this speaking
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