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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB189811645


Patent:GB 189811645
Title:An Improved Abacus or Instrument for Rapid Calculation
Date:08.08.1889
Place:London
Country:Great Britain
Person:Raphael Kabalkin
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 GB189811645


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