Abstract: An asymmetric open rosette constellation has multiple inclined orbit planes distributed around 360.degree. with the satellites asymmetrically spaced in the orbit planes. The satellites populate only a portion of each orbital plane so as to leave an open space in each orbital plane. The open architecture can readily accommodate spare satellites in a useful manner.

Abstract: A patient-user interactive psychotherapy apparatus for use in Eye Movement Desensitization and Reprocessing treatment is disclosed. The psychotherapy apparatus includes a pair of visual displays, each for displaying an image having an emotional impact on a particular patient-user. The visual displays are positioned horizontally spaced from one another in the patient-user's field of view. The visual displays are each operable between two operational states including: a first operational state, wherein the image is highly, visually perceptible by the patient-user; and a second operational state, wherein the image is less visually perceptible by the patient-user. A pair of hand held switch inputs for switching between the two operational states of each visual display is also provided. In use, the patient-user alternately actuates the hand held switch inputs which causes the image to be alternately displayed as a highly, visually perceptible image in a back and forth manner on the two visual displays.

Abstract: A method and apparatus accurately positions a selected cranial implant site for x-ray tomography. The method and apparatus comprise making a stent of the mandible and maxilla of a patient and making a mark on the stent at a position which corresponds to the selected cranial implant site. The stent is then positioned with regard to a tomographic x-ray imaging apparatus so that, (a) the mark on the stent is aligned with a light beam, preferably generated by a laser source, projected downwardly to intersect the central axis of the tomographic apparatus and, (b) the selected plane through the mark is perpendicular to the x-ray beam of the tomographic apparatus.

Abstract: A keel hoist assembly for use in raising and lowering the keel of a retractable keel sailboat and including a winch unit and a generally tubular retractable support tube. The winch unit is removably mountable to a top end of the retractable support member which, in turn, fits within a tubular receiving column provided to the sailboat and extending between the bottom of the boat hull and the deck. The retractable support member is adapted for telescoping movement within the tubular receiving column and is movable between a first retracted position within the tubular receiving column and a second extended position wherein the support member is disposed extended upwardly at a distance above the top deck. locking pin members are provided to lock the support tube in the retracted and extended positions. When not in use, the winch unit is removed from the retractable support tube and stowed below deck and the retractable support member is moved to its retracted position and locked in place.