our grandmothers generation filled the munitions and machine shops during WW2. Did something cause more recent generations to avoid machinery?

Both images found on http://progress-is-fine.blogspot.com

I've worked at a Sears tire and service center, a machine shop and mechanical assembly  shop... and I've never seen or heard of a woman working in either. Anywhere or anytime. I have posted racers, pilots, etc.. but it seems like the machine shops and aircraft assembly plants are without a ratio of men and women equal to the human population. In light of the photo evidence here, women have proven the worth of their work by building and assembling the aircraft the won WW1 and WW2. Below, WW1 aircraft being built