Well, THAT is a find! I have never heard of such a catalog even in Germany itself. For sure a fountain of knowledge.
I would have put the hanger in question to the LW general degen as I remember photographs where such hanger have been used with them.
As often there is a multiple possibility of usage, but the original purpose is most interesting.
Thank you for showing, perhaps you can show us a little more of the catalog?
Regards,
