A few updates from my side:
Sweden, pre-1970: no fixed standard for live and neutral, rather local customs. In some regions white was live and black neutral, in others just the opposite. Other common phase colours were green and yellow. Red - as in Germany - could serve a variety of functions, e.g. earth, traveller, switched phase etc.
Hungary: same as Germany until about 1960 when neutral became blue instead of grey, around ten years later earth was changed from red to yellow/green too.
Germany: seriously confusing. Grey has been neutral/PEN since the 1920s or even longer. Red, however, was only introduced in 1958 for earth in fixed wiring (and various other purposes) and already abandoned again in 1965 in favour of yellow/green. In reality, red was also frequently used as a PEN in some regions.
Separate earth conductors in fixed wiring did not exist in the VDE regulations prior to 1958, those in flexible cords were red.
