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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G02B27/09
Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
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