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1920 Keuffel & Esser Thatcher's Calculating Instrument Model 4093 w/ Manual:
$675.99
The 1920 Keuffel & Esser Thatcher's Calculating Instrument Model 4093 is a vintage scientific calculator that is highly sought after by collectors. This rare piece comes with its original manual, adding to its value and authenticity. The instrument is a prime example of the precision and craftsmanship of early 20th-century scientific equipment, making it a prized addition to any collection of vintage science instruments.
