The Giotto and the Bianchi are lovely! Upright trikes are great fun - especially the 2WD with a diff - but sure ain't easy to master. And Ken Rogers and Longstaffs are more "special" than the Jackson.
there is more http://www.embacher-collection.at/
the collection by mr. embacher is pretty impressiv. its located in the 7th district in vienna but afaik its not publicly accessible.
"Cyclopedia, the second illustrated volume on the Embacher Collection after Smart Move, was published in February 2011."