From: cd@notformail.com   
      
   Hi all,   
      
   Anyone seen one of these before? The IC itself has four bjts on a   
   single die according to the schematic, but - again according to the   
   schematic - there's no connection for whatever this thing mounted on   
   top is, which resembles a very thin button cell. The board it comes   
   from is dated 1970, so unless you're an old geezer,  you won't   
   recognize it anyway.   
      
   https://disk.yandex.com/i/N1dGB_EIUYbf6A   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)