The picture above shows a patent filed by Hugo Blomberg in 1968 and published in 1970. It is a so called wallbracket for standing telephones. More information can be found here. To my understanding this is the first patent for this kind of accessory. A rather strange looking phonestand I would say. Not sure if they were ever put into production.
Since 1968 a few more patents can be found. This is another one from Hugo Blomberg with more or less the same purpose, filed in 1976.
More information on this wall-stand for telephone sets of standing handset type patent can be found here. For some reason I do not have any connection with these kind of inventions. Nevertheless there was even a patent filed in 2013 for mobile phones…
The dutch word for wall is muur by the way.