911
The Cintra/Tektronix 911 aka Statistician 911 is a desktop statistical calculator with a Nixie display.
It replaces the Log(x), tan(x), hyper, and π keys of its scientific-type sister model 909 with factorials and statistical functions.
The 926 Programmer provides programming functionality with conditionals, branching and subroutines for the 909/911.
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