A connecting device for oral and extra-oral prostheses which is partially implanted in bodily tissue, primarily bone tissue, by means of an anchorage unit (a fixture) that provides more favorable stress and force distribution between the implanted and the outer portion of the prosthesis located peri-tissually. The connecting device includes a cap-shaped matrix (6) whose base is connectable to the anchorage unit by an intermediary spacer (1), and the matrix (6) which includes a resilient portion,...

An amusement device is shown which comprises a lightweight bag tethered at its opposite ends to upper and lower, pivotal swivels. The bag is suspended by the upper cord and the lower cord has a length substantially greater than the normal distance of the bag from the lower swivel. The bag is readily deformable and resilient so that it cannot cause injury. The cords are elastic and resilient so that when it is struck by a players hand, or fist, it gyrates and travels in an unpredictable fashion p...

A support surface such as a table 23 has support arms 12, 21 for mounting the support surface on a seat or seats 10, 11 of a motor vehicle, for example for use as a picnic tray or work table. Each support arm 12, 21 has a location portion 14 shaped such that it can be forced into the gap which exists on almost all car seats between the squab portion 10 and the upright portion 11 to be gripped thereby. There is also a foot portion 16 which is shaped to rest on the squab portion of the seat.

A metal vapor laser which can produce two or more discrete outputs from a single vacuum chamber. This is achieved by using two or more different materials and by confining each material to its own area so that the materials do not mix one with the other and optimum lasing performance can be obtained from each material. All the lasing areas have a common optical axis. The lasing outputs can be produced separately or mixed together as required.

A lubrication system for supplying viscous, solvent-based, lubricants to heavy industrial plant, such as a driving gear of a sugar mill comprises a reciprocating lubricant pump which is periodically actuated to deliver lubricant to a spray head. Air is supplied under pressure to the spray head to effect discharge of the viscous lubricant in spray form. The air supply continues for a pre-determined time after discharge of the lubricant to evaporate solvent in the lubricant and also to clean the s...

An exercise device for strengthening a user's targeted muscle, such as a bicep or the like, and a method for the assembly of the exercise device. The device includes a spherical housing having a weighted casing disposed. The housing has a cut-away portion and further has an opening formed therein which are in communication with each other. When the hand of the user is disposed in the opening, a forceful grip is not required during use of the exercise device. Thus the conjunctive use of adjoining...

A transport device is provided which includes a pair of opposed parallel plates having respective outer edges spaced apart from one another to form an open slit area between the outer edges and an inside area between respective central portions of the opposed plates. Both the outer edges are movable and are adapted to receive the articles thereon to transport the same. A suction device sucks air from the outside through the open slit area and into the inside area to hold the articles by suction ...

A manually operable hand braking device for such as but not necessarily confined to, a wheel (23) of a wheel chair. The device including a mounting member fixed adjacent the wheel periphery (23a), and a body part (5) mounted for partial rotation about an axis (7) of the mounting member (1) (2) extending transversely of the wheel (23); movement of the body part (5) being effected by a hand grip (26) and lever part (24), extending from the body part (5). The body part (5) being provided with two p...

Semiconductor apparatus comprises a split-gate semiconductor device (1) which has a first layer (3) of a first undoped semiconductor material (e.g. GaAs) and a second layer (4) of a second semiconductor material (e.g. AlGaAs) which is doped through at least part of its thickness. The second material has a higher energy band gap than the first material, and the layers form a heterojunction so that electrons from the second layer collect in the first layer to form a two-dimensional electron gas. D...

A game apparatus has a housing and a removable lid for covering the housing. A brief flash of high-intensity illumination is provided when the lid is removed. A number of playing pieces randomly positioned within the housing receive the illumination of the flash. The playing pieces briefly radiate color-coded visible light after receiving the flash, forming a random pattern of colored light. At least two players may view the game pieces to form impressions of the locations of the playing pieces ...