Signals equipment of a Finnish air force airbase from World War 2: wall phone, VPK 10 TA telephone central, P-1-8 field telephone and a German Hellschreiber teleprinter. Photographed in the Finnish Air Force signals museum.
<a href="//commons.wikimedia.org/wiki/User:MKFI" title="User:MKFI">MKFI</a>
<span class="int-own-work" lang="en">Own work</span>