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Double Convex Spherical, lenses made of extra white glass with ground edges, highly polished.
Spherical, made of extra white glass with ground edges, highly polished. Designed specially for universities. Dia 50mm, focal length 300-1000mm
Spherical, made of extra white glass with ground edges, highly polished. Designed specially for universities. Dia 50mm, focal length 300-1000mm
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