the only woman race car owner, manager or promoter during the 1930s and '40s, Portland’s Dorothy Hylah Gruman, whose team raced midgets and big cars under her Duchess Racing Team in Oregon and California

During the war, in 1942, she was employed at the Portland Port of Embarkation. Her husband Ralph Gruman was a boxer and then later a boxing referee and promoter. Born November 8, 1899

After purchasing her first race car in 1935, her fleet included a Dusenberg, McDowell, and the above air-cooled Douglas 

https://www.jalopyjournal.com/forum/threads/vintage-shots-from-days-gone-by.428585/page-5977#post-12903787

https://www.worldofspeed.org/archive-blog-1/2018/9/7/oregons-own-the-duchess-only-woman-race-car-owner-promoter