Patent classifications
G
PHYSICS
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G02
OPTICS
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G02C
SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
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G02C7/10
Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
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G02C7/108
Colouring materials
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