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I have 2 sets using 21FBP22's and they have a safety glass that is attached around the edge of the tube so the resulting installation looks somewhat like a 21FJP22 but there is no bonding to the tube face. One of the safety glasses is etched like on a 21FPB22 and one is clear.
I know the difference in the look from the plain 21FBP22 with no glass as my CTC-10 has a 21GVP or 21GUP22 that has no attached saftety glass but it has the seperate rectangular tempered glass panel.
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