http://www.smithairfield.com/postwar.html
"In 1966, a significant innovation in hangar architecture and engineering
took place with the construction of the Carousel Hangar. Clark W. Smith of
Decatur, Indiana, patented the design of the Carousel Hangar in 1965. Mr.
Smith built this prototype four-place hangar in 1966, and it is the only
example of this design ever built."
I saw some hangars very much like these at the Monterey CA airport some
years
ago. IIRC they were scheduled to be torn down (they were rather
decrepit).
David Johnson