Before I post a solution to one of the two unidentified productmobiles, I have to share a little story with you.
When I saw that there's a German vehicle from 1931 and another from 1934 I instantly knew that the original pictures came from Motor magazine. It was a lavish monthly, published from the 1910s to the 1940s. If you ever met the French Omnia magazine, you get the idea.
I recalled that there are no volumes of Motor in Hungarian libraries, but then I checked out the on-line catalog of the Technical University Library and saw that they had 1931 indeed. So today I went to the depot of the Library - the place where I usually check out various years of Automobile Revue (and find nice puzzles and materials for my auto history class). They know that I am a kind of automobile history freak, and as the manager of the depot was at hand he showed me a couple of magazines awaiting to be sent to the shredder. I immediately jumped into action and saved 8 years of Automotor Journal (a British publication from the 1910s), a couple years of La France Automobile and about 2 years of Autocar. It was this very puzzle, which led me to saving these beautiful publications!!! Thank you
And now, onto Productmobiles. I found the 1931 one, relating the Berlin Wintergarten Varieté. The car was based on a 1-ton Brennabor chassis. Please find enclosed a picture and a description in German
As for the 1934 productmobile - you have to wait until June when I will get to Austria and as I have to do some research there, I'll check out the relevant issues of Motor then.