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Tops of the Model 25 FCO's.
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Here are the top views. As you can see LOTS Of differences here too. Like the photocell socket, the back bumps, and more.
Also the OLDER ITT has the "Level" and "Level" in the shape of a "T". The other one just has a cross.
Why is that?
And there are three screw bumps on the Heat sink on the older and only two on the newer.
Three bumps on the newer in the slipfitter area and only two bumps on the older.
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Why did they change that?