Semicircular mirror made of stainless steel.
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Diffraction Gratings replica mounted on a plate glass.. 2400 (lines/in) 7500 (lines/in) 15000 (lines/in)
9cm x 14.5 cm , pack of 25 sheets.
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Optically worked, in velvet lined case
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