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File:Mechanical-calculator-Brunsviga-800-01.jpg - Wikimedia Commons
John Wolff's Web Museum - Brunsviga
Antique Trinks Brunsviga Mechanical Calculator. Germany, Circa 1920 Working Pin- | eBay
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The Brunsviga Calculator] - UNT Digital Library
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Brunsviga | A Collection of Mechanical Calculators
Brunsviga calculator No. 633, Grimme, Natalis, & Co. (later Brunsviga Maschinenwerke), Braunschweig, 1897 Stock Photo - Alamy
Antique Trinks Brunsviga Calculating Machine. Germany, Circa 1920
Brunsviga 10
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The Brunsviga Nova 13 Mechanical Calculator
