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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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G02B5/20
Filters
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G02B5/28
Interference filters
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G02B5/284
of etalon type comprising a resonant cavity other than a thin solid film, e.g. gas, air, solid plates
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