When was vacuum tube invented?

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When was vacuum tube invented?

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1) Which of the printers used in conjunction with computers uses dry ink powder?

2) A system is

3) In most of the IBM PCs, the CPU, the device drivers, memory, expansion slots and active components are mounted on a single board. What is the name of the board?

4) In which year was UK’s premier computing event called ?The which computer? started?

5) Instruction in computer languages consists of

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