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Slide_Rules
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Edwin Thacher's 1881 Slide Rule Patent
Link Details for:
Edwin Thacher's 1881 Slide Rule Patent
Link Title:
Edwin Thacher's 1881 Slide Rule Patent
Link URL:
http://www.americanartifacts.com/smma/thachpat.htm
Link Details:
Specification forming part of Letters Patent No. 249117, dated November 1, 1881. Includes diagrams.
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Top : Science : Math : Education : Slide_Rules
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