Edwin Thacher's 1881 Slide Rule Patent

Edwin Thacher's 1881 Slide Rule Patent
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Details of Edwin Thacher's 1881 Slide Rule Patent

About Edwin Thacher's 1881 Slide Rule Patent
Edwin Thacher's 1881 Slide Rule Patent- Specification forming part of Letters Patent No. 249117, dated November 1, 1881. Includes diagrams.
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