CPC Subgroup
G03B 27/18 Maintaining or producing contact pressure between original and light-sensitive material
Full Title
Photographic printing apparatus > Exposure apparatus for contact printing > Details > Maintaining or producing contact pressure between original and light-sensitive material
2 direct subcodes
Child Classifications
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- G03B 27/20 by using a vacuum or fluid pressure
- G03B 27/22 by stretching over a curved surface