Braun BNE001BK (Reissue of the Braun ET66 Calculator), Black : Office Products - Amazon.com
Three Braun calculators, ET33, ET55 and ET66, designed by Dieter Rams and Dietrich Lubs, 1977 - 1987 . and inspiration for the iPhone design Stock Photo - Alamy
Iconic 1987 Dieter Rams-designed Braun calculator to be re-released this year - The Verge
Ed Artifact: Calculating change - Graduate School of Education - University at Buffalo