At the workshop of the Finnish Broadcasting Company, the power gain field designed for the Sortavala Broadcasting Station is being finalized in 1938. The exact date is estimated.
<div class="fn value">
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/124495553@N05">Archives of the Finnish Broadcasting Company Yle</a></div>
1 January 1938, 15:23:46
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/ylearkisto/15301046597/">https://www.flickr.com/photos/ylearkisto/15301046597/</a>