<a href="https://en.wikipedia.org/wiki/en:Teisco" class="extiw" title="w:en:Teisco">Teisco</a> <a rel="nofollow" class="external text" href="http://brochures.yokochou.com/keyboard-and-effector/teisco/1980jan/en_05.html"><b>MX-600</b></a>, back panel
<a href="//commons.wikimedia.org/wiki/User:Soulkeeper" title="User:Soulkeeper">Soulkeeper</a>
<span class="int-own-work" lang="en">Own work</span>