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Patent:GB214919


Patent:GB 214919
Title:An improved apparatus for calculating percentages
Date:01.05.1924
Place:
Country:Great Britain
Person:Reginald Sidney Carr und William Ronald Fountaine Sange
Company:
Internal Links:Prozentrechner, Proportionalrechner
Keywords:
Link to the patent office:
(without guarantee)
 GB214919


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Aus der Patentschrift GB214919