Abstract: A deep-drawn rectangular shadow mask having a blind edge between the aperture area and the upright skirt. In each corner of the blind edge, weakened portions are formed extending parallel to the diagonal of the mask, to compensate for the buckle load occurring during bilateral drawing of the mask. The weakened portions are formed by rows of elongated pits parallel to the corner diagonal, or blind slots parallel to the diagonal.

Abstract: A cathode ray display tube has a mild steel envelope part (10) with a tubular copper pump stem (20) sealingly attached thereto by friction welding. A method of attaching the pump stem involves forming the pump stem initially with a closed end, rotating the pump stem relative to and against the mild steel envelope part and applying pressure to cause friction welding of the pump stem, and thereafter extending the pump stem's bore through its closed end by drilling. A hole may simultaneously be drilled through the envelope part. The friction weld provides reliable vacuum-tightness and strength, and the attachment of the pump stem in this manner can be accomplished using automation quickly and inexpensively.

Abstract: Device to drape draw a nickel-iron alloy, etched-aperture sheet, including means to heat the sheet at a temperature between 150.degree. and 250.degree. C. during drawing, whereby a 0.2% proof stress of the shadow mask material is reached below a tensile stress of 150.sup.N /nm.sup.2. Accurate reproduction of shadow masks is thereby achieved with minimized detrition of the tooling.

Abstract: Prior drape to drawing a nickel-iron alloy, etched-aperture sheet, it is subjected to an annealing treatment between 700.degree. and 820.degree. C. so as to produce complete recrystallization without grain growth of any significance. During the drawing process the sheet is maintained at a temperature between 150.degree. and 250.degree. C., a 0.2% proof stress of the shadow mask material between 150.degree. and 250.degree. C. being reached below a tensile stress of 150 .sup.N /mm.sup.2. Accurate reproduction of shadow masks is achieved with minimized detrition of the tooling.

Abstract: In electric lamps having a lamp envelope (20) of a type of glass containing at least 95% by weight of SiO.sub.2, the current leadthrough conductors (22, 23) usually consist of molybdenum foils to which internal (26, 27) and external (24, 25) current conductors are welded.After welding and upon making the pinch seal (21) of the lamp vessel (20), fracture frequently occurs in the molybdenum foils (22, 23).Molybdenum foils (22, 23) in which yttrium oxide particles are dispersed in a quantity of 1/4-1% of the molybdenum weight, have proved to be considerably stronger than similar thickness molybdenum foils containing no yttrium oxide.