| 摘要 |
681,706. Lamp screens. KILEMNIK, M. April 27, 1949 [April 27, 1948], No. 11188/49. Class 75(iv) A screen in particular for tubular lamps 2, comprises a plurality of intersecting walls 1 of transparent plastic material, at least one face of each wall having depressions or protrusions of e.g. prismatic or lenticular shape formed thereon. The depressions or protrusions may comprise parallel or intersecting grooves or ridges, and the walls 1 may be coloured. The screen may be used with two lamps of different colours whereby their lights are mixed. |
