It appears these were sold in the 1950s and 60s.
Photo of real ones.
Youtube video which shows a few shots of them in action, but it’s not the exclusive focus of the video.
It appears these were sold in the 1950s and 60s.
Photo of real ones.
Youtube video which shows a few shots of them in action, but it’s not the exclusive focus of the video.
Same amount of steps. More track!