Prototype of a shortwave radio telephone designed by L. W. Sarkki, made in the Yleisradio laboratory, 1940. Time of photograph estimated to the month.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/124495553@N05">Archives of the Finnish Broadcasting Company Yle</a></div>
May 1940<div style="display: none;">date QS:P571,+1940-05-00T00:00:00Z/10</div>
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