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DE562443C
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Registration paper
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DE500658C
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Process for the production of ink-proof and ink-proof blueprints as well as copies without the effect of light
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DE601135C
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Device for developing blueprints
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DE538495C
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Process for the production of recording paper
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DE536841C
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Registration paper
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DE419177C
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Method of making a positive iron blue paper
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DE403902C
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Production of a positive iron blue paper (blue lines on a white background)
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DE403586C
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Manufacture of iron blue paper
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DE390164C
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Manufacture of iron gall paper
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DE394083C
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Process to increase the photosensitivity of iron blue paper
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DE388511C
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Process for making iron blue paper
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