OA-175/FPS-3C Planned Position Indicator (PPI) Used extensively on radar sites to display Search and IFF video ... early 1950s all tube design with mechanical rotation and magnetic deflection on a 12" round screen type 12ADP7A

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OA-175/FPS-3C Planned Position Indicator (PPI) Used extensively on radar sites to display Search and IFF video ... early 1950s all tube design with mechanical rotation and magnetic deflection on a 12" round screen type 12ADP7A