Abstract: A magnifier for imaging film units is provided. A magnifying lens is coupled to a view box which may be a stationary view box or mass film motorized viewer for viewing X-ray images. A positioner is provided for positioning the magnifying lens proximate the particular area of interest of the image. Normally, the magnifier remains coupled to the view box, but may be detached such that the view box can operate as a standard view box. With this arrangement, standard view boxes are retrofitted with the present invention. The positioner is hinged to both adjust the focal distance of the magnifier and position the magnifier away from the view box in an open position which does not obstruct the view of the image. The positioner may be coupled to a longitudinal arm situated on a side of the view box which is manually moved or may be driven by one or more motors at the control of an operator's console. Patient information and positions of the magnifier may be entered via the operator's console and stored in a memory.

Abstract: Color coding the components of a dental positioner, including an aiming ring, a bite block and an indicator arm allows the operator to assemble the correct positioner for proper positioning and alignment according to a particular dental area to be X-rayed. The color coding corresponds to different dental areas including the anterior and posterior dental areas. For coronal areas, a bite-wing block is provided which also may be in the color coded.

Abstract: A roller head securable to the discharge end of an extrusion machine, wherein the roller head has a pair of rollers each rotatable between a pair of arms pivotable about an axis transverse to the extrusion machine. Each roller is movable with respect to the other roller and to the axis of the extrusion machine by a pair of pressurizable cylinders arranged between the pivotable arms. The rollers are rotatable, even in their separated state, by an articulated drive system which permits roller rotation during machine output and during roller support arm movement. The rollers are permitted to "float" on a hydraulic suspension system utilizing an accumulator wherein the separation of the rollers is dependent upon the volume of extrudite being forced therethrough.