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It seems as though the 21FBP22 uses the same implosion protection as a PVA-type tube w/the PVA removed, that is, a form fitting safety glass that is taped around the rim, but not bonded to the CRT.
I have heard that the 21FPB22 has no implosion protection, but this can't be true as I have 2 sets that use it and none has a seperate flat safety glass that remains in the set.
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