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Offgrid Pocket Calculator  RSS feed

 
steward
Posts: 3477
Location: Kingston, Canada (USDA zone 5a)
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No electrical power required, no batteries... a mechanical calculator. Really cool, but not cheap ($1k on ebay).

 
gardener
Posts: 7139
Location: Victoria British Columbia-Canada
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At a fruit market in Chinatown, there is a lady whose hand speed is faster than Bruce Lee. Her abacus skills put most modern inventions to shame. Might not work so well as a mortgage calculator.
 
I like tacos! And this tiny ad:
The Earth Sheltered Solar Greenhouse Book by Mike Oehler - digital download
https://permies.com/wiki/23444/digital-market/digital-market/Earth-Sheltered-Solar-Greenhouse-Book
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