Abstract: A metal honeycomb heating element is protectively mounted in an enclosure comprising a one-piece enclosure wall, the heater being supported between a circumferential support member and a circumferential compression ring attached to the enclosure wall. A diametrically balanced compressive force is maintained on the edges of the heating element by the compression ring and support, this force operating to significantly extend the life of the heater element under hot vibration. Heater slot separators and electrode feedthrough structures for extending the life of the heater element are also provided.

Abstract: A mirror image apparatus for use with a pantograph for drawing, engraving, milling, and similar applications wherein tracing and creating a mirror or reverse image is required. The apparatus is characterized by broadly having a stylus which operates between a first plane and a second plane. The first and second planes are parallel to each other with the second plane disposed above the first plane. One end of the stylus is used for drawing an image or tracing an image on the first plane while an opposite end of the stylus is used for engaging and creating on the second plane a mirror image of the drawing or tracing produced on the first plane. When drawing, the stylus may be a pen, pencil or any other drawing instrument wherein the stylus has opposite ends for drawing an image on the first plane while at the same time creating a mirror image on the second plane.

Abstract: Selected portions of a glass sheet are heated to elevated temperatures and offset, i.e. reformed, relative to the remaining portions of the glass sheet while maintaining the optical properties of the remaining portions of the glass sheet. The reformed area can be used as a structure to which guide brackets are other hardware can be secured or as an integral glass ledge to guide the up and down movement of the glass sheet within a vehicle door frame.