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 5998-01-370-4802
NSN 5925-01-066-0646
NSN 5975-00-196-0698
NSN 5950-00-931-4079
NSN 6135-00-767-0331
NSN 5855-01-023-3727
NSN 5960-01-444-2205
NSN 5855-01-352-7033
NSN 5960-00-271-1396
NSN 5985-00-541-7714
NSN 5855-01-495-2670
NSN 5920-00-050-4976