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PCE
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CPC Subgroup
G02B 27/44

Grating systems; Zone plate systems (G02B27/46 takes precedence)

Full Title

Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 > Diffraction optics (G02B27/60 takes precedence) > Grating systems; Zone plate systems (G02B27/46 takes precedence)