Soviet wire sound recorder MN-61 for ground air traffic voice recording, recording military ground-to-air voice communications, and playing back recording made by the MC-61 flight recorder. Built since 1961 by <i>Vilma</i> in Vilnius and the Rybinsk Instument Plant (<a rel="nofollow" class="external autonumber" href="http://www.rzp.su/company/history.php">[1]</a>). This is a very compact (326x241х236 mm) but very tightly packed (12 kg weight) unit for the period.
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