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US1730942A
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Tool for engraving rollers applicable for the treatment of photographic films
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GB281617A
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Tools for engraving rollers applicable for the treatment of films for use in colour photography
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GB261363A
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Improved manufacture of films for colour photography
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GB246829A
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Improvements in or relating to photographic films having lenticular elements thereon
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GB247169A
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Improvements in or relating to developing photographs
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CA277395A
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Engraving process
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CA274945A
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Roller engraving method
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CA285953A
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Cinematographic projecting objective
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CA289494A
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Film roller engraving tool
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CA285954A
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Machine for reproducing cinematographic films
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