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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G02C7/02
Lenses; Lens systems; ; Methods of designing lenses
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G02C7/08
Auxiliary lenses; Arrangements for varying focal length
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G02C7/088
Lens systems mounted to spectacles
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