describe an invention that appeared before computer

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describe an invention that appeared before computer.

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2015-05-28 TSEB 53.33 Check this speaking
2014-08-27 devabe2005 41.54 Check this speaking
2014-11-08 Fadlanmuzakki 67.50 Check this speaking
2013-02-04 devabe2005 78.75 Check this speaking
2014-03-29 prathapreddy 70.00 Check this speaking
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