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Die große Enzyklopädie des mechanischen Rechnens

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Brevetti  Gran Bretagna  1898

 
  • Patent:GB189712347 19.05.1898 Redmund Naish : A New or Improved Contrivance for Mechanically Determining Per Centages and other numerical results
  • Patent:GB189721268 12.03.1898 American Arithmometer (P) Comp. : Improvements in Printing Attachments for Calculating Machines
  • Patent:GB189809600 25.06.1898 American Arithmometer (P) Co. : Improvements in Locking the Keys of Calculating and like Machines
  • Patent:GB189814635 15.10.1898 Max Levi : Improvements in and relating to Computing Scales

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