Computer pioneers

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Across
  1. 2. Bardeen is an american engineer that invented at Bell Labs on December 23, 1947
  2. 4. Circuit is a small electronic device developed in 1950s.
  3. 6. Beyer was a German was a video game developer
Down
  1. 1. is a mathematical and digital electronics.
  2. 3. is a Cd software.
  3. 5. E. Kurt z is a retired Dartmouth professor of mathematics.