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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB187704258


Patent:GB 187704258
Title:Improved calculating machine
Date:28.12.1877
Place:Slough
Country:Great Britain
Person:John Purvis Hawtrey
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 GB187704258


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