The Eureka Sanitor was advertised from 1930 to 1940. For those interested, one is currently listed on eBay. Check it out here: https://www.ebay.com/itm/354916509077...
The hair-dryer made appearances in ads from 1929 to 1944. Here's a Youtube video of it:
Photos
1-4: Sanitor & Cake
5: 1930 May 27 YOUNGSTOWN VINDICATOR - ad listing hair-dryer & Sanitor
6: 1940 Nov. 12 YOUNGSTOWN VINDICATOR - M-60 ad