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Yea , I'm unfortunately sure about the display of only + , - , and 1 , because I saw the datasheet on all of the numitron tubes and indeed the 2020 is limited to those three characters only . The other numitrons , listed 2200 if I recall correctly , do have the digits 0 through 9 . There were plug in varieties and hard wired types that had different part numbers , in all I think there were maybe 6 different types listed .
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