describe an invention that appeared before computer

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describe an invention that appeared before computer.

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2014-10-22 Sina sina 80.00 Check this speaking
2014-12-19 devabe2005 50.00 Check this speaking
2015-07-01 avijit_05 70.00 Check this speaking
2015-04-26 CarliYay 85.00 Check this speaking
2015-03-21 Gauresh 56.00 Check this speaking
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