One piece metal cone for a cathode ray tube

Claim 1

A SHADOW MASK TYPE COLOR CATHODE RAY TUBE INCLUDING A COMBINATION, A ONE-PIECE METAL SHELL HAVING A MAIN BODY PORTION IN THE SHAPE OF A PYRAMIDAL FRUSTUM, THE SMALLER END OF SAID BODY PORTION HAVING A GENERALLY CIRCULAR OPENING THEREIN, AN ANNULAR FLANGE AROUND SAID CIRCULAR OPENING, A GENERALLY CYLINDRICAL GLASS ELECTRON GUN CHAMBER HAVING A FLANGE PORTION SEALED TO SAID ANNULAR FLANGE, THE LARGER END OF SAID BODY PORTION BEING OPENED AND HAVING A SIDE WALL DEFINING A SUBSTANTIALLY RECTANGULAR OPENING, THE FREE MARGINAL EDGE OF SAID SIDE WALL BEING FORMED INTO FIRST AND SECOND STEPS TO PROVIDE INNER AND OUTER SEATING LEDGES SUBSTANTIALLY RECTANGULAR IN CONFIGURATION, SAID INNER SEATING LEDGE BEING CONTINUOUS WITH THE MARGINAL EDGE OF SAID SIDE WALL AND INCLUDING A FIRST OUTWARDLY EXTENDING LEDGE PORTION AND A FIRST UPWARDLY EXTENDING FLANGE PORTION, SAID OUTER SEATING LEDGE BEING CONTINUOUS WITH SAID FIRST UPWARDLY EXTENDING FLANGE PORTION AND INCLUDING A SECOND OUTWARDLY EXTENDING LEDGE PORTION AND A SECOND UPWARDLY EXTENDING FLANGE PORTION, THE PERIPHERY OF SAID INNER SEATING LEDGE, A GENERALLY THAN THE PERIPHERY OF SAID INNER SEATING LEDGE, A GENERALLY RECTANGULAR OUTWARDLY CURVED GLASS FACEPLATE PANEL SEATED ON AND SEALED DIRECTLY TO SAID INNER SEATING LEDGE, A TRANSPARENT SAFETY WINDOW HAVING THE SAME GENERAL CONTOUR AS SAID FACEPLATE PANEL SECURED IN SAID OUTER SEATING LEDGE, AND A PLURALITY OF INWARDLY EXTENDING INDENTATIONS DISPOSED AROUND THE PERIPHERY OF SAID UPWARDLY EXTENDING FLANGE PORTION OF SAID INNER SEATING LEDGE FOR ALIGNING SAID FACEPLATE PANEL WITH THE AXIS OF SAID ELECTRON GUN CHAMBER WITH SAID PANEL BEING SEATED ON SAID INNER SEATING LEDGE.