Looking at the NEC, it seems as though the requirement for two small appliance circuits has been in place a good many years. Can anybody place when these separate circuits were first required by code?

Similarly, it appears that the 3VA per square foot rule (residential) for general circuits has also been there a long time.

Can anyone summarize the NEC requirements, and/or typical arrangements of small appliance and general circuits over the years, purely out of historical interest?