1
Robert K Fogg Jr, Christopher P Staehli: Stand-aid invalid wheelchair. The United States of America represented by the Secretary of the Navy, R S Sciascia, George J Rubens, October 18, 1977: US04054319 (63 worldwide citation)

A wheelchair is designed to enable an invalid to stand, sit or choose at l any intermediate position to perform useful work, and to move about in any of said positions. The wheelchair helps to fulfill the psychological and physiological needs of handicapped persons. The lifting and lowering operatio ...


2
Robert K Fogg Jr, Christopher P Staehli: Stand-aid invalid wheelchair. The United States of America represented by the Secretary of the Navy, R S Sciascia, G J Rubens, October 10, 1978: US04119164 (22 worldwide citation)

A wheelchair is designed to enable an invalid to stand, sit or choose at l any intermediate position to perform useful work, and to move about in any of said positions. The wheelchair helps to fulfill the psychological and physiological needs of handicapped persons. The lifting and lowering operatio ...