describe an invention that appeared before computer

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describe an invention that appeared before computer.

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2014-01-18 Diena Fitriya H 60.91 Check this speaking
2014-02-26 ajigayuh2 72.86 Check this speaking
2015-06-06 devabe2005 68.00 Check this speaking
2015-03-09 venkataramanarikku 73.33 Check this speaking
2014-02-08 bjskishore 61.52 Check this speaking
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