An air system prosthesis for amputees includes a hollow body with stiff peripheral walls and an open end and a cup shaped partition defining with the walls a first socket. A hollow stump support second socket with stiff peripheral walls is snugly nested within the first socket upon the partition. The...http://www.google.sh/patents/US4655779?utm_source=gb-gplus-sharePatent US4655779 - Air system prosthesis for amputees
