Patent classifications
G
PHYSICS
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G02
OPTICS
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G02B
OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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5/00
Optical elements other than lenses
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G02B5/1814
structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
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G02B5/1819
Plural gratings positioned on the same surface, e.g. array of gratings
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