G PHYSICS
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G02 OPTICS
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G02B OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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27/00 Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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G02B27/28 for polarising
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G02B27/286 for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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