I do remember curb feelers, but I am not familiar with “Brodie knobs”. Can you explain that reference?
Yes, curb feelers are legal, but until you tell us what Brodie knobs are, I can’t give you any opinion on that. However, whatever opinions are given on this board, you have to remember that they are merely opinions. For a specific answer regarding legality, you have to contact the appropriate authorities in your state.