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 6135-01-125-4867
NSN 6150-01-222-9581
NSN 6105-00-435-2713
NSN 2925-01-054-3190
NSN 6110-00-904-8925
NSN 5855-01-077-6264
NSN 5835-01-090-0784
NSN 5905-01-566-6886
NSN 6220-00-266-8222
NSN 5996-01-581-4160
NSN 5920-01-081-5800
NSN 5990-01-357-6175