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Bi-concave glass lenses Manufacturers Description of Bi-concave glass lenses : Bi-concave glass lenses are manufactured with both surfaces concave. These lenses have negative focal lengths.
Posted Date: 12 Jul 2012
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Optical Window Manufacturer Description of Optical Window : Windows are applied to isolate different physical environments while allowing light to pass. When selecting windows you should con
Posted Date: 11 Jul 2012
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