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PCE
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CPC Subgroup
G03B 27/44

for multiple copying of the same original at the same time (G03B27/34, G03B27/53 take precedence)

Full Title

Photographic printing apparatus > Projection printing apparatus, e.g. enlarger, copying camera > for multiple copying of the same original at the same time (G03B27/34, G03B27/53 take precedence)