They used incandescent lamps to display stats, the same technology Daktronics relied on for the next 25 years, through an exclusive contract to provide the scoreboards for the 1980 Winter Olympics in Lake Placid, New York, large displays for Caesars Palace in Las Vegas and an electronic voting system for the U.N.

FORBES: Magazine Article

In New York's Adirondack Mountains, inmates break ice on a frozen lake to make a giant winter palace.

WSJ: NY inmates help build ice palace in Adirondacks