My goodness! What were they made of that made them so lightweight!
I honestly don’t know but they were designed to be carried into Europe by gliders. Maybe they weren’t sturdy enough for their jobs once they were on the ground and that’s why the whole idea was scrapped.
I have a LOT to learn about the items in there. The little I’ve learned is just from overhearing the guys when they’re taking someone through on a guided tour.