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CA121510A
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Process of producing printing plates
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GB190721026A
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Improvements in Etching Processes and Apparatus therefor.
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US865276A
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Art of etching.
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GB190405917A
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Process for Producing Etchings from Negatives or Positives of any kind.
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GB190000249A
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An Improved Method of Making Screens or Light Sub-dividers for use in Making Process Blocks.
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US758338A
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Art of photomechanical printing.
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GB189818672A
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An Improved Process for Transferring to Stone or Metal any Desired Drawings, Paintings, or Photographs for Reproduction in One or More Colours.
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