A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6685-00-017-9516
NSN 6240-00-286-0742
NSN 6240-01-267-6499
NSN 5905-00-554-4325
NSN 5915-01-174-7542
NSN 6110-01-384-4292
NSN 6220-01-466-8702
NSN 6110-01-294-7827
NSN 5835-01-426-6573
NSN 6685-01-349-4450
NSN 5920-01-634-0250
NSN 5855-01-278-8922