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 5915-00-622-0390
NSN 6105-01-059-2307
NSN 6685-00-372-4670
NSN 6650-01-398-1884
NSN 6150-01-417-8815
NSN 6150-00-895-6523
NSN 5915-01-311-5416
NSN 5990-01-200-7460
NSN 6150-01-341-0010
NSN 6220-00-918-1099
NSN 5945-01-593-1912
NSN 5996-01-630-3169