The projection of electron beams that are transmitted by the slot apertures and strike the fluorescent screen can be made straight by boring slot apertures in advance that are curved in the direction opposite {HEAD ~ the curvature} of {TAIL ~ the electron beam projection} 
The projection of electron beams that are transmitted by the slot apertures and strike the fluorescent screen can be made straight by boring slot apertures in advance that are curved in the direction opposite { HEAD ~ the curvature } of { TAIL ~ the electron beam projection }
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