When was vacuum tube invented?

When was vacuum tube invented?

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1) Which of the following is the first computer to use Stored Program Concept?

2) IBM 1401 is

3) Which of the following storage devices can store maximum amount of data?

4) Which of the following is used as a primary storage device?

5) The magnetic storage chip used to provide non-volatile direct access storage of data and that have no moving parts are known as