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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Canada  1967

 
  • Patent:CA757487 25.04.1967 Frans W. Ruijs : Setting device to be operated by means of keys, destined for an adding or calculating machine, a caSH-register or such like device
  • Patent:CA771026 07.11.1967 Julius N. Cayo : Withholding tax computer

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