Pair of CO2 powered upper limb prostheses for a 12 year old boy who lost both arms, above the elbow, at 8 years of age. Leather sockets with valves mounted for stump control, to activate powered wrist rotation units. Body-powered split-hooks by means of Bowden cables, routed to outer side of each arm. Compound pulley device for elbow lock control. 31 gramme CO2 gas cylinder in leather holster, carried on trouser belt. Made by Steeper 1964.