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Die große Enzyklopädie des mechanischen Rechnens

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Patente aus Großbritannien 1830 bis 1839


  • Patent:GB183006038 13.11.1830 John Tyrrell : Apparatus for Teaching Arithmetic
  • Patent:GB183107591 10.03.1831 Oliver Byrne Abraham Parker : Instrument for gauging malt and the fluid or solid content of casks and other vessels.


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