Grass stimulator system. Quincy, MA: Grass Medical Instruments, 1970. 5 instruments. Built by Grass Medical Instruments of Quincy, Massachusetts, these instruments were used to stimulate the brain and spinal cord.
W-P Instruments Stimulator system. New Haven, CT: 1970. Built by W-P Instruments of New Haven, Connecticut, this instrument was used to stimulate the brain and spinal cord.