There is also probably a lot I could do with this timeline idea for other subjects.
One idea is appointing on a timeline when the 3x3x3 cube was available on a free market. For instance, it seems to be late summer 1981 for Czechoslovakia, early 1980 for the U.S., late 1977 for Hungary, 1978 for the UK, etc.
It is impossible to name every single country but you get the idea. Nevermind if you don't like it.
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