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symbol G02B27/4238
modified 2013-01-01-04:00^^<http://www.w3.org/2001/XMLSchema#date>
title Diffraction optics having a diffractive element [DOE] contributing to a non-imaging application in optical recording or readout devices
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broader http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B27-4233

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