I've liked Nixie tubes ever since I first same them, many many years ago. It is something about how all the numbers are present but only one can be seen.
During my tech school days in 1979 I purchased a Radio Shake calculator that had a display of Nixie tubes. I can't remember the model but it was forest greet with black around the keys. Almost 6in tall, 4in wide and an 1 inch thick.
I was so disappointed when I left the sucker on the subway. Money was tight and learning a new calculator in the middle of tech school was a ***.
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