| 摘要 |
A display device having a heat-proof insulating base plate having formed therein on one side a plurality of grooves, a plurality of cathodes disposed in the grooves in a manner not to project out from the surface of the base plate, an anode common to the cathodes and a transparent glass tube envelope having enclosed therein all the elements mentioned above, and a method of sealing the glass tube envelope by the use of infrared ray absorbing glass of low melting point.
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