Abstract: A key holder is for keys with standardized heads of about the same width as standard key blades. The key holder includes a casing which has a flat base wall and a plurality of parallel, spaced-apart, elongated key compartment side walls extending integrally upwardly from the base wall to form a plurality of parallel key compartments. Keys are pivotally mounted in outer end portions of the key compartment side walls on removable cap screws and are pivotable about openings in the key heads and these cap screws from storage position inside of the casing to position for use of the key outside of the casing. Leaf springs, one in each key compartment, push the keys against the side walls with sufficient force to frictionally hold the keys in place each within its own key compartment whether or not one or the other of the cap screws is temporarily removed to insert or remove other keys.

Abstract: A jet aircraft is equipped with powered helicopter type rotor blades and control mechanisms whereby it can take off and land vertically, yet in horizontal flight can operate at speeds and altitudes typical of jet aircraft. The rotor blades are foldably retractable to a compact locked, trailing position for horizontal travel and are readily unfoldable by a manually operated control mechanism within the aircraft. While the rotors are rotating, the blade pitch can be selectively controlled and, on power failure, will be automatically controlled to provide for same direction autogyro rotation. In one form, the wings and stabilizers are tiltable between substantially horizontal positions for normal horizontal flight and substantially vertical positions for vertical flight. The craft is ground supported by flexible legs.