Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B44
DECORATIVE ARTS
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B44F
SPECIAL DESIGNS OR PICTURES
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1/00
Designs or pictures characterised by special or unusual light effects
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B44F1/06
produced by transmitted light, e.g. transparencies, imitations of glass paintings
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B44F1/066
comprising at least two transparent elements, e.g. sheets, layers
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