I had a Columbia built bike that I was told was a paratrooper bike, but it had fenders and I can't confirm it. It was a full 26" wheeled bike with the ability to come apart in the center with the use of a locking lever. Handle bars were of the folding variety, skip tooth chain, and the seat post had a lever that acted much like a modern quick release. It was a heavy bike...In any case it was the only full sized folder I've ever seen.
Art Smith in sunny Phoenix where I'm experimenting with riding a fully submerged Masi in the pool as a political response to the freakin' heat.