The Haydu Brothers built vacuum tubes for Burroughs, the calculator company,
in the mid-1950s before being bought by Burroughs. They made the first Nixie tubes
as well as the first beam switching tubes, which were decimal counting tubes.
This tube is complicated! Here's the base diagram from an enclosed piece of paper.
The tube design is patented by Burroughs. Argue all you want about whether Burroughs
or Haydu designed it; the patent was assigned to Burroughs. Look it up!
The box is a curious mix of Haydu labeling and a big Burroughs sticker on the top.