Patent classifications
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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G02B17/02
Catoptric systems, e.g. image erecting and reversing system
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G02B17/06
using mirrors only; , i.e. having only one curved mirror
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G02B17/0626
using three curved mirrors
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G02B17/0636
off-axis or unobscured systems in which all of the mirrors share a common axis of rotational symmetry
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