G PHYSICS
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G02 OPTICS
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G02B OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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1/00 Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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G02B1/10 Optical coatings produced by application to, or surface treatment of, optical elements
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G02B1/11 Anti-reflection coatings
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G02B1/113 using inorganic layer materials only
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