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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB670031


Patent:GB 670031
Title:Improvements in electrical calculating apparatus
Date:09.04.1952
Place:
Country:Great Britain
Person:Arthur Edward Roulston
Company:
Internal Links:
Keywords:
Link to the patent office:
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 GB670031


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Aus der Patentschrift GB670031