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US2861008A
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Production of light-sensitive material for diazotypes
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US2413764A
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Tracing medium
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US2253562A
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Photosensitive transparency
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US2323469A
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Manufacture of transparentized sheets for drawing, tracing, and copy reproduction
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US2154506A
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Manufacture of blue-print sheets
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US2150832A
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Manufacture of tertlary amine of the dimethyl aniline type
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US2157206A
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Manufacture of diazo type material
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US2135872A
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Development of exposed blueprint sheets
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US2027229A
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Accelerated diazo printing and materials therefor
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US1597483A
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Slide rule
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US1521632A
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Printing frame
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US1118031A
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Marking-pen.
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US1170975A
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Vertical-filing cabinet.
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CA378291A
|
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Diazo type material
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CA394842A
|
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Tertiary amine manufacture
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CA422918A
|
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Tracing medium
|
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CA382189A
|
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Blue-print sheet developing method
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CA339065A
|
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Photographic diazo printing
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CA817361A
|
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Production of light-sensitive diazotype compositions and coats
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CA843877A
|
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Production of azo dyes developable by heat
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