Uchitel' arifmetiki (Учитель арифметики, Arithmetic teacher) by Elektronika has now been preserved in MAME.
The game is based on the Soviet clone of the SM511 and looks like this:
![[Linked Image from i.imgur.com]](https://i.imgur.com/MYm9VK4.jpeg)
There is no evidence of a real unit yet. Only two hardware parts are available at the moment: PCB with chip, and LCD.
As the device did not come into mass production, it's considered to be just a prototype.
The game title is not fully determined. An old magazine mentions a game called "Учитель арифметики" and this reference was used as the most likely name for this game.