The (very simplified) Blackmer gain cell - a Valley, Inc. class-A development (EGC-101). Base-to-base connections are actually done with external wiring, not on chip (here they are shown "inside" for simpler layout)
<a href="//commons.wikimedia.org/w/index.php?title=User:Retired_electrician&amp;action=edit&amp;redlink=1" class="new" title="User:Retired electrician (page does not exist)">Retired electrician</a>
<span class="int-own-work" lang="en">Own work</span>