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GB867517A
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Method of producing a subtractive colour film
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GB814347A
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Method of producing a subtractive colour film copy
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Arc lamp with air current concentration
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Method for processing a subtractive motion picture film
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Process for the manufacture of a subtractive colour film
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Embossed projection screen
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GB766052A
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Process for the manufacture of embossed screens
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Projection screen
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US2914989A
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Reflector
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GB755189A
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Reflector
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GB746328A
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Improvements in or relating to arc lamps
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GB741078A
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Positive head for high-intensity blown arc lamps
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US2788459A
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Positive head for high-intensity arc lamps
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GB745586A
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Carbon electrodes for high-intensity arc lamps
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GB725106A
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Television projection apparatus
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GB743812A
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Enciphering device
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Enciphering device
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GB737212A
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Apparatus for the transmission and reproduction of color television images
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GB725726A
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High-intensity arc lamp for continuous operation
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US2786958A
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High-intensity arc lamp for continuous operation
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