2226 what is the important invention before the age of computer?what is the inventionwhy do you think it is very importantwhat are the advantages and disadvantages of the invention

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2226 what is the important invention before the age of computer?
what is the invention
why do you think it is very important
what are the advantages and disadvantages of the invention

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2017-10-25 EugeneDubinchuk 70.00 Check this speaking
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