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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB224930


Patent:GB 224930
Title:Photographic exposure calculator
Date:17.11.1924
Place:
Country:Great Britain
Person:John R Hewett
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 GB224930


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Aus der Patentschrift GB224930