A lamp comprising an elongate light source and a coaxially transparent sleeve surrounding the light source, wherein the light source is fixed at one end in the sleeve by means of a cured cement, wherein a cement barrier is present between the light source and the sleeve for preventing the cement in its uncured state from entering the middle portion of the lamp, and wherein said cemenit barrier is made of a somewhat flexible material.

 
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> Plasma display panel and method of driving the same

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