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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G02B17/023
for extending or folding an optical path, e.g. delay lines
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