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spreiti
on Oct 23, 2018
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The Slide Rule
A practical implementation of a slide rule can be found on watches such as the Breitling Navitimer. I like to use it for quick currency conversions when traveling.
z2
on Oct 23, 2018
[–]
And most are helpfully marked for unit conversions as well! I have mine set for restaurant tipping by default (North America).
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