Abstract: A cassette holder has multiple compartments; each compartment has a leaf spring for urging a cassette into one or the other of two stable positions. The first stable position, a cassette stored position, has the spring bearing on top of a cassette and forcing the cassette tightly against the bottom of a compartment. The second position, a cassette removal position, has the spring bearing against the upper back wall of a cassette to maintain the cassette canted with an upper corner protruding from the compartment for ease of grasping by a user. A pivot at the junction of a pocket and an upper section of the back wall of each compartment rotates a cassette to the removal position upon the application of finger pressure on the bottom of the cassette. A second pivot in the form of a foot at the entrance of each cassette causes the cassettes to pivot out of the compartment on being pulled and prevents a cassette from being pulled directly out of a compartment.

Abstract: A hand operated apparatus for reducing the size of racket handles such as used in tennis rackets is described. A base in which racket handles are secured has raised opposed sides, the edges of the sides defining a guide plane. The guide plane is parallel to the center line of the handle secured within the base. A frame, having an adjustably extendable blade means, is adapted for slideable contact with the edges so that the blade means removes material from the racket handle in a plane parallel to the center line of the handle. A control means is provided for adjusting the depth of cut of the blade means. By repeated operation, uniform depth cuts can be made on each face of a racket handle to maintain symmetry.

Abstract: The patient simulator provides a skull with a mandible and maxilla relatively arranged and supported for movement simulating that of a human mandible and maxilla, and having a skin covering with the natural appearance and "feel" of the human skin. The simulator additionally includes a resilient tongue, and soft palate or velum which with the skin covering defines the mouth cavity. With practice dentures releasably secured to the mandible and maxilla the dental student can practice on various tooth conditions under substantially normal working conditions.