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 6105-00-078-3282
NSN 6150-01-235-3253
NSN 6150-00-252-2316
NSN 6645-01-252-8870
NSN 5985-01-266-6278
NSN 6650-01-435-2994
NSN 2925-01-467-7672
NSN 5945-01-134-7701
NSN 5835-00-074-3700
NSN 5935-01-623-5089
NSN 6130-01-312-4562
NSN 6220-01-370-5980