Maybe during WW2?
No question. WW II
Sure it's WWII. Look at the top. They're "Victory Girls"!
This was followed by the "bikini car wash".
Women of that era did most everything. My Mom drove a Caterpiller tractor during WWII. She once told me that I was never bothered by the noise of the tractor, as I would sleep peacefully in her lap while she drove.
Unfortunately, Mom was quite hard of hearing by middle age. And now I'm hard of hearing also. Gee, I wonder why ?
My aunt welded on Liberty ships while her brothers went away to the war. 20 some odd years later my Dad called her to do some welding on a project for the church camp. A little bit of practice and she was back at it. She graduated from college shortly after the war and went on to teach Chemistry and Physics.
Mom helped build B-24s at Willow Run.