The <i>Minerva Miraphon 500U</i> was built in Austria in 1949-1950 <a rel="nofollow" class="external autonumber" href="https://www.radiomuseum.org/r/minerva_miraphon_500u.html">[1]</a>.
<a href="//commons.wikimedia.org/wiki/User:Karl_Gruber" title="User:Karl Gruber">Karl Gruber</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>