Abstract: A previously used lock assembly constructed for operation using a given key may be operated by a different key after rebroaching. Instead of requiring an expensive, complete replacement of a lock assembly and its operable keys, the present invention allows a lock assembly to be refitted for a different key by a relatively inexpensive replacement of its plug and at least one of the tumbler components, preferably the bottom pin only, of one or more preexisting sets of tumbler components, as needed to modify the lock to receive the different key.

Abstract: A display device is disclosed which comprisees a plurality of positive lenses disposed in a concavely curved lens array as seen by an observer and a plurality of substantially concavely curved pictures respectively associated with the lenses. Each of the pictures is disposed behind the respective lens and is located substantially at or within the focal length of the respective lens. The pictures each comprise a plurality of picture elements such that, when the lens array is viewed from different angles by an observer, the observer is able to perceive a composite image formed from magnified images of the picture elements of different ones of the pictures.

Abstract: An autogyro has rotor blades carried by a rotor head mounted on a support member (10) rotatable about a pitch axis (18) and independently rotatable about a roll axis (22) for control of the autogyro in pitch and roll respectively. The pitch and roll axes intersect one another in order to overcome the problem of rotation about one axis affecting the radius of rotation about the other axis. Means are provided to prevent rotation of the rotor head and support member about an axis orthogonal to both the pitch and roll axes.

Abstract: A therapeutic inhalator variably proportions and mixes a plurality of pressurized therapeutic gases at a high volume flow and supplies them on a demand basis rate to a patient from a mixing chamber inside a body of generally cylindrical configuration. Gases, such as carbon dioxide, oxygen, and nitrous oxide, are delivered from separate supply circuits to separate demand valves. Demand valves located at the inlet portals of the inhalator body are capable of delivering gas to the mixing chamber when unblocked by an aperture in the wall of the mixing chamber which acts as a proportioning member by regulating which of the inlet portals are coupled to the mixing chamber and what extent each portal is exposed. There are one or more apertures in the proportionary member. The mixing chamber communicates the mixed gases to the patient via a wide-mouthed opening which fits over the nose and mouth.