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IIRC Dumont made a tricolor tube with 3 separate guns. Each neck on the CRT was mounted separately on the bell 120 deg offset from the others (from the back the necks looked like a convergence yoke). the screen consisted of a pattern of triangular pyramids inside with each side having a different phosphor painted on so that only the gun that faced that side could scan it's phosphor. To me it looked less awkward than the triniscope and color wheels.
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