ADO-13, one of the first modular, fully sealed <a href="https://en.wikipedia.org/wiki/operational_amplifier" class="extiw" title="en:operational amplifier">operational amplifier</a> (ca. 1968) from <a href="https://en.wikipedia.org/wiki/Fairchild_Semiconductor" class="extiw" title="en:Fairchild Semiconductor">Fairchild Semiconductor</a> USA (size of the later standard µa 741 for comparison)
<a href="//commons.wikimedia.org/wiki/User:Drdoht" title="User:Drdoht">Drdoht</a>
2010-10-09
<span class="int-own-work" lang="en">Own work</span>