Patents

LeBlanc, M., Nelson, C. & Carlson, L., "Rotary Thumb Prosthesis", U.S. Patent No. 4,990,162, Feb. 1991.
Carlson, L.E., Frey, D.D. & Brown, E.S., "Locking Mechanism for Voluntary Closing Prosthetic Prehensor", U.S. Patent No. 5,800,571, Sep. 1998.