Telephone user set including amplifier apparatus operating with an electroacoustic transducer provides signal output on a pair of lines which also supply the operating power. One embodiment operates at high gain in response to voice input signal and operates with low gain in the absence of voice input signal for providing suppression of background noise.

An open-top elongated, foldable V-shaped urination trough for use following prostatic surgery to channel urine away from a patient's body and to prevent its discharge onto clothing and skin, has base and tab portions formed from a single sheet of flexible material. The sheet is folded so that the base portions form sidewalls of an elongated trough. The tab portions are bent into engagement with each other to form a finger hold and to define an opening near one end of the trough.

Provided is an alarm box in which the user is temporarily detained during the operation of the box. A handle switch is provided which, upon manual grasping causes the sending of a tamper signal. The handle is located on an alarm box housing. Cuffs are joined respectively to the alarm box housing (below the handle) and to a cover. The cover is pivotally joined to the housing for closing the cuffs upon the arm of the user. Within the cuffs are pressure sensitive switches that form a part of an ele...

A mouthguard, serving to protect the teeth, temporomandibular joint, head and neck, is user formed of silicone material by placing uncured silicone material in a tray, impressing the upper teeth into the material, removing the tray before complete curing of the material, impressing the biting or occlusal surfaces of the lower teeth into the material, and permitting the material to cure. The tray is flexible and may comprise two or more separate or separable pieces to facilitate removal. The tray...

A closed user group facility in a data transmission system which has a closed user group of terminals accomodated in a switching network, and in which the switching network registers a terminating terminal in response to a request for registration of that designated terminating terminal from another one of the terminals. The registration of the corresponding terminating terminal is with one of codes with which all the terminals accommodated in the switching network can be individually identified...

An apparatus for supplying oxygen to a person at a mine site upon the depletion of atmospheric oxygen or the filling of the air with smoke or dust particles or poisonous fumes comprising a helmet having a visor shiftably mounted thereon for normally assuming an out-of-use position and for assuming an in-use position over the face of a user upon manipulation thereby. An oxygen-containing vessel is attached to a belt worn by the user, with a conduit connected at one end to the vessel and at the ot...

A swimming pool user warning system which warns as to the presence of a would-be unauthorized user of a swimming pool comprising, in combination, an electrical warning alarm, a normally open electrical switch and a compressible air-filled hose having both a normal undepressed condition and an actuated depressed condition. The hose is constructed in relation to the switch such that the latter is maintained open as long as the former is in its undepressed condition and such that the latter is clos...

A memory module containing addressable memory devices, and the circuits necessary to address and drive these devices, is configured so that a trade-off between memory size and word length can be made by rewiring the backplane. Thus, a single memory module design can be used for a variety of computer memory applications. This is accomplished by incorporating on the module a complete set of addressing and signal driving circuits, and allowing for the control of these module components through a sy...

The sink includes a basin with a drain-equipped rear portion of usual depth, or of depth adequate to perform intended tasks, and a substantially shallower forward portion. The exterior bottom of the sink portion in the front of that basin is correspondingly recessed to accommodate the knees and part of the lap of a seated user. Beside the stepped basin, the sink may have a second basin, for instance wholly of conventional depth. A number of optional sink inserts are disclosed including an imperf...

A portable screed for working concrete and which is mounted on the user. The screed includes a variable length screed plate, a vibrator for the screed plate, a frame attached to the screed plate, a body harness connected intermediate the ends of the frame, and a balancing weight positioned so that the center of gravity of the screed is essentially coextensive with the center of gravity of the operator. The body harness is adjustable along the frame, and the frame may be adjustable as required to...