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Casio Men's Data Bank Digital Dual Time Calculator Red Resin Watch CA53WF-4B - Walmart.com
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Vintage Heuer Calculator 110.633 Blue Dial sold on watchPool24
1971 Heuer Calculator - Cal. 12 - Ref. 110.633
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Vintage Heuer Calculator 110.633 Unpolished sold on watchPool24
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Seiko Rare Calculator Slide Rule Vintage Automatic Chronograph... for $2,567 for sale from a Trusted Seller on Chrono24
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Heuer Calculator Chronograph ref 110.633 circa 1977
Slide rule: what is it, and how does it work?
