I used to have this calculator, and I have a feeling it is actually somewhere in my office at Cadence, but since I've not been there for over 18 months I can't really check. This is the Braun ET66 calculator. The chief designer at Braun was Dieter Rams. His minimalist "less is better" style of design was very influential. and has resulted in products that are regarded as classics.
The ET66 calculator originally went on sale in 1987, 34 years ago. Looking on Amazon, I see that the latest version is called the BNE001BK but it is described as a "reissue of the ET66" and can be yours for $49. Like the Ford Model T, you can have it in any color as long as it's black. This classic calculator can be found in the permanent collection of the Museum of Modern Art New York.
I'm not the only person who liked the design. Jonny Ive of Apple clearly used it as the model for the calculator on the iPhone. Here is the original iPhone calculator:
Dieter didn't just create classic designs for Braun, he put down his philosophy. Of course, he was talking mainly about the design of physical objects, especially consumer electronics products, but many of the principles are timeless and can be applied to software or semiconductors.
I don't know what it is about calculators that makes their design so timeless, but the HP-12c went on sale on 1st September 1981, which makes it older even than the Braun ET66. So it had its 40th birthday just a few weeks ago. I wrote its story on its 35th birthday in my post Happy Birthday, HP 12c—35 Years and Counting. It is also still available. HP will sell you one for $69.99, but Amazon will let you have one for $55.95.
You can see hints of both these calculators in the two varieties of the iPhone calculator app.
First, Braun mode:
Second, HP mode:
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