From: chuck23@dejanews.net   
      
   On Sun, 21 May 2023 11:07:38 +0100, Cursitor Doom    
   wrote:   
      
   >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   
   This will probably replace it. https://www.ebay.com/itm/125671758106   
      
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