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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Canada  1969

 
  • Patent:CA819563 05.08.1969 Tibor Arvai Sperry Rand (P) Corp. : Calculating machine
  • Patent:CA820139 12.08.1969 Frans W. Ruys : Apparatus for actuating a result unit of a calculating machine, and the like, each time when the apparatus is operated

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