According to some collectors that have the same vacuum as I do, this model had a power nozzle as an extra. It is a non flexible hose and on the other side of the vacuum there is a "socket" where the power cord of the power nozzle could be plugged.
However, I havent seen any on sale, anywhere. So I question wheter it had a power nozzle or not.
It is indeed a fact that there is a socket for something...
Thanks for your information by the way!