about blowers, dryers, showers and "Föhne"
Petek is correct on that one: "Heißluftdusche" = literally "hot air shower". (which is the old German word for hair dryer / blow dryer, the word was used from the 20s up until the 50/60s. About the time when colorful plastics came up people called it "Haartrockner" (hair dryer) or simply "Föhn" (a brand name of AEG's hair dryers, they spelled it "Foen").
(Föhn = sudden warm falling winds in the Alps, a special type of climate in Bavaria).
Translation:
"The hot air shower (blow dryer)... is a versatile accessory for your vacuum cleaner which can be put to many new uses through this little and practical device. Everywhere in household and business where you need an intense stream of hot air, this blow dryer is a welcomed helper (instructions on next page).
How to work with the "Heißluftdusche" using the vacuum with the hose:
1. Connect hose to blower side of the cleaner and turn unit on for a moment.
2. Turn off vacuum and connect the blow dryer to the end of the hose.
3. Unplug cable connector from the main unit. Plug double connector of the dryer into the main unit. Now plug the cable connector back in.
4. Turn on vacuum cleaner. Immediately you get a stream of hot air from the blower unit.
How to work with the dryer using the vacuum without the hose:
1. Connect the hot air accessory to the blowing side of the main unit using the short wand. All other steps are identical to using the dryer with a hose (no. 2-4)
Please note:
Turn the hot air blower on and off with the switch of the vacuum cleaner.
The hot air unit has an automatic air flow switch, so a burning out of the heating element is impossible."
For other "Heißluftduschen" on vacuums, see here:
http://www.vorwerk-museumprivat.de/24579.htmlan old user manual (30s):
http://www.vorwerk-museumprivat.de/mediac/400_0/media/Aufgezeichnet~2005-2-18-34vorne~00000.JPGaccessories:
http://www.vorwerk-museumprivat.de/50255.html
Also other firms had these blow dryers (Tornado, Siemens, Philips) but unfortunately I have no links about them. Sometimes they were sold together with a vinyl drying hood or a comb.
Weirder vintage accessories were cow and horse brushes, even a small laundry unit (sort of a wooden barrel with holes in the bottom, the air would make the suds bubble and foam. I guess it did not clean well) or shoe polishers.
Happy blowing ;-)