bn:00029601n
Noun Concept
EN
echelon
EN
A diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset WordNet 3.0
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EN
A diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset WordNet 3.0 & Open English WordNet
WordNet 3.0 & Open English WordNet
EN