It-is-generally-thought-that-the-first-operating-s -- Multiple sentences match

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It is generally thought that the first operating system used for real work was GM-NAA I / O, produced by General Motors ' Research division in 1956.

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It is generally thought that the first operating system used for real work was GM-NAA I / O, produced in 1956 by General Motors ' Research division for its IBM 704.

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