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US2971977A
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Preparation of ethylidene malonodinitrile
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GB779223A
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Process for the production of colour developed multicolour prints which are resistant to light
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GB758627A
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Process for the production of direct photographic positives by the silver salt diffusion process
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GB767978A
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Improvements in or relating to the production of direct positive photographic imagesby the silver salt diffusion process
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GB753729A
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Container particularly suitable for storing transparencies
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GB729004A
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A colour filter and apparatus for the determination of printing filters in colour photography
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US2709135A
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Process for the direct production of positive photographic images
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US2699393A
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Photographic process for the direct production of positive images
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US2694008A
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Process for the production of colored masks in photographic color material
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CA592873A
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Masking frame for making enlargements
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CA604761A
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Photographic material for the production of photographic records with tone value correction
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CA586745A
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Process for the production of several positives from one negative by the silver salt diffusion process
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CA587243A
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Process for the reproduction of monochrome or multi-color originals
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CA592871A
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Masking frame
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CA628822A
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Magnetic record carriers
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CA614052A
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Photographic filter and antihalation layers
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