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Sister model Statistician 911 replaces the Log(x), tan(x), hyper, and π keys with factorials and statistical functions.
The 926 Programmer provides programming functionality with conditionals, branching and subroutines for the 909/911.
- Tek 909/911 @ oldcalculatormuseum.com
- Tek 909 @ dustyoldcomputers.com
- Tektronix calculators @ vintagetek.org