Abstract: A kit of components for advertising purposes comprises a coated steel panel, a filling device having a plurality of coated steel sheets, and a plurality of flexible magnetic characters made from rubber or similar synthetic material having incorporated therein magnetic material such as barium ferrite such that the characters are both flexible and magnetic and may be applied either to the display panel or the filing device in a flat condition. When applied to the filing device the characters may be stored and transported without damage.

Abstract: An electrically illuminated sign has a box-like frame with a front face opening and encloses a message plate displaying a message unit through the opening. A separate opaque border strip circumscribes the message unit of the message plate forwardly overlying the same and being forwardly engaged by a frame flange. Opposite side parts of the border strip have directional signal openings formed therethrough normally exposing a contrasting coloration of the message plate therethrough and selectively slidably removable cover strips are positioned between the message plate and border strip covering the border strip directional signal openings with a coloration matching the border strip. The sign may be attached to a mounting surface by a two-piece mounting bracket having a first part secured to the frame and a second part securable to the mounting surface with the bracket parts having slidably interfitting dove-tail portions securing the parts.

Abstract: Novel tool operating apparatus is exemplified in a dental treatment device capable of driving alternatively at least a first tool and a second tool, each tool being intended to execute a different form of motion, with a single tool driving means to which each of several different tools can be removably coupled. The driving means includes a rotatable drive shaft fitted with tool engagement means in the form of a disc affixed to the shaft and lying in a plane that makes an acute angle with the rotational axis of the shaft. One tool can be fitted over the shaft to engage the disc so as to rotate the tool with the shaft. A second tool can be fitted over the shaft so that the shaft can rotate within the tool, but the tool will not rotate with the shaft. The second tool has means for cooperating with the shaft so as to execute an oscillatory motion relative to the shaft axis.

Abstract: An apparatus for controlling the actuation of a light for illuminating the work zone adjacent the operative end of a dental handpiece. The apparatus includes (a) switch for actuating a light source when a signal is transmitted to the actuating switch from the power transmitting line for the dental handpiece, (b) line for transmitting the signal to the actuating switch from the power transmitting means for the handpiece, and (c) delay shutoff switch associated with the actuating switch for maintaining the light source on for a predetermined period of time after transmission of power to the operative end of the handpiece is terminated and then causing the light source to be extinguished at the end of the predetermined period of time.

Abstract: In combination with a suction apparatus to eject saliva from the mouth of a human being during dental procedures, an attachment to be attached to the open end of a suction tube. The attachment comprises a suction apparatus cover in the form of a cloth, a fine mesh screening or a porous plastic material which is to evenly distribute the application of the vacuum across the exterior surface of the cover.