I have looked and looked for ANYTHING on these. There is aprox 35 of them. Pat. 1-20-20 and 1-4-27. I cleaned the one . A very well made piece. Not sure if they were for auto or not . The loop size is adjustable. The only thing I am sure of is they are RARE !! Can't find anything about them . Selling all of them together in an old hair pin box. A search of the patent reveals that these are hair rolling clips.