Carabiner and brakebar.
Red Eiger carabiner and brake bar used for rappelling, circa early to mid '70's. Fortunately, this setup never really caught on. The standard rappel at this time used 6 carabiners and was a lot safer if done correctly.
or send your donation payable to: Yosemite Climbing Association P.O. Box 89, Yosemite, CA 95389 Please make sure to provide your complete contact information, including email address.