I wonder if someone has collected together the timescales on which professions went from "of course women can't do that, don't be ridiculous" to "of course women can do that". I'd guess some would start earlier than others, and some would make the transition faster than others. Our own profession of programming seems to be one of the laggards in both, potentially even going backwards in its youth. Would probably be interesting to see the data laid out graphically if it could be made objective in some way (first admitted to college, first professor, achievement of parity in numbers perhaps?)