G PHYSICS
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G02 OPTICS
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G02B OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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17/00 Systems with reflecting surfaces, with or without refracting elements
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G02B17/08 Catadioptric systems
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G02B17/0864 having non-imaging properties
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G02B17/0868 for light condensing, e.g. for use with a light emitter
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