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