3-channel Olympia 40/3 microphone amplifier, built at the Yleisradio workshop in Helsinki in the late 1930s. The time of shooting is estimated with a monthly accuracy.
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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>
February 1942<div style="display: none;">date QS:P571,+1942-02-00T00:00:00Z/10</div>
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