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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G02B5/1876
Diffractive Fresnel lenses; Zone plates; Kinoforms
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G02B5/189
Structurally combined with optical elements not having diffractive power
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G02B5/1895
such optical elements having dioptric power
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