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Also I think that the 21FBP22 many times includes a form-fitting safety glass that is attached to the tube but is not bonded with resin like the 21FJP22. I've got 2 sets using 21FPB22 and they do not use a rectangular tempered safety glass plate that remains in the set like in the 50's sets. One is a replacement that I did but the other is a Zenith w/Zenith brand crt so I know that's how it originally was.
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