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Screen for film projections of metal plate, thin and stamped or engraved to obtain the relief, of the projected image and, at the same time, a remarkable economy of electrical energy. (Machine-translation by Google Translate, not legally binding)
Screen for film projections of metal plate, thin and stamped or engraved to obtain the relief, of the projected image and, at the same time, a remarkable economy of electrical energy. (Machine-translation by Google Translate, not legally binding)
Screen for film projections of thin metal plate (copper aluminum zinc or other metal) in one piece or composed of elemental bands or strips presenting a surface stamped or punctated by projections in the form of prisms or regular pyramids or not and provided with small holes evenly distributed over the entire surface, the projection surface being opposite the prismatic surface. (Machine-translation by Google Translate, not legally binding)
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