Unit 029
Henry L. Gankenau. US1985866A. The page says patented Dec. 25, 1934.
Bent from a single piece of wire. Formed by bending a length of spring wire.
An outer clamping member and an inner clamping member, united by a straight cross-bar.
One end portion has a single rectangular loop. The opposite end portion has a double loop, V-shaped in the lengthwise direction. Two spaced V-shaped loops at one end. Nested loops in the same plane.
No dimensions are stated. A missing length is not invented.
Source: https://patents.google.com/patent/US1985866A/en
Not a Gem double oval. Not Cole. Not Kelley. Not Michelson.