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US1785883A
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Apparatus for engraving printing rollers
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GB304575A
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Improvements in apparatus for engraving printing rollers
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US1730955A
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Device for obtaining adjustably interspaced and inclined hatchings in the electromagnetic process for engraving printing rollers
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GB282668A
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Improved control or regulating apparatus for apparatus for engraving printing rollers
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GB282667A
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Improvements in apparatus for engraving printing rollers
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US1695617A
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Process of and apparatus for engraving printing cylinders
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GB248645A
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An improved process of and apparatus for engraving printing rollers
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