Christoph Frey

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Aesch, CH

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Patents Grantslast 30 patents

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Electrophotographic imaging process using anthraquinoid black pigme...
- Patent number 4,191,566
- Issue date Mar 4, 1980
- Ciba-Geigy Corporation
- Remy Jeanneret
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY