Pair of CO2 powered upper limbs for a 10 year old boy

Pair of CO2 powered upper limbs for a 10 year old boy born with absence of the left arm and a rudimentary right above elbow stump. Plastic sockets with a leather inner socket on the right side. Full shoulder cap on the left side. Standard (Dorrance) right split-hook, [body powered by means of a Bowden cable, routed to the outer side of the arm]. CO2 gas powered left split-hook operated by the shoulder (acromion process) activating the valve set on the shoulder cap. Powered right wrist rotation unit, operated by valve sited on the outer side of the socket and activated by stump pressure. Left split-hook operated by Bowden cable with perlon cord. Fully-automatic elbow mechanisms with locking/unlocking control from perlon cables sited across the chest. Made by Steeper 23 November 1973.