Half a century ago GE introduced Square Fluorescent Lighting
Fifty years ago today General Electric introduced fluorescent lighting that "freed you from the limits of tubes".
In 1961 you could buy lighting by the square foot for coffered ceilings, small openings, signs and even mobile units could use these new Panel Fluorescent lamps.
Need more info? "Write: General Electric Co,, Large Lamp Dept,C-604, Nela Park, Cleverland, Ohio.