When did V1, VR, and speed bugs come into use?

[Shrikered]

thanks - this is amazingly specific

Thanks to everyone for this information. Especially to IGH - I am tracking down Joop W's book and article, and indeed they will save me a lot of research! It's interesting that the criteria originated 50 years ago, but at least they are slowly being rethought (judging by what I have read so far).