American engineer <a href="https://en.wikipedia.org/wiki/Edwin_Howard_Armstrong" class="extiw" title="en:Edwin Howard Armstrong">Edwin Armstrong</a> the inventor of the <a href="https://en.wikipedia.org/wiki/superheterodyne" class="extiw" title="en:superheterodyne">superheterodyne</a> radio receiver, with his new wife <a href="https://en.wikipedia.org/wiki/Esther_Marion_MacInnis" class="extiw" title="w:Esther Marion MacInnis">Esther Marion MacInnis</a> in Palm Beach, Florida, in 1923.  The radio is a portable superheterodyne set that Armstrong built as a gift for her.
Unknown author<span style="display: none;">Unknown author</span>
1923
<a rel="nofollow" class="external free" href="http://www.k3dav.com/edwinhowardarmstrong.htm">http://www.k3dav.com/edwinhowardarmstrong.htm</a>