by mechanical connections, e.g. by cam, by linkage

Full Title

Photographic printing apparatus > Projection printing apparatus, e.g. enlarger, copying camera > Means for automatic focusing therefor > by mechanical connections, e.g. by cam, by linkage

Child Classifications

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• G03B 27/38 embodying screws with non-uniform pitch
• G03B 27/40 adapted for use with lenses of different focal length