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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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G02B17/0836
using more than three curved mirrors
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G02B17/084
on-axis systems with at least one of the mirrors having a central aperture
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