Diffraction Grating, LH 22.46

LH 22.45 Diffraction Grating (Hilger & Watt Type) 15000 Lines Per Inch, (600Lines/Mm) (Routine Quality)
LH 22.46  Diffraction Grating (Hilger & Watt Type)15000 Lines Per Inch, (600Lines/Mm) (Superior Quality)
LH 22.47 Diffraction Grating (Hilger & Watt Type)25000 Lines Per Inch, (1000Lines/Mm) (Superior Quality)
LH 22.48 Diffraction Grating (Hilger & Watt Type) 2500 Lines Per Inch, (100Lines/Mm) (Superior Quality)

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