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 5920-01-371-3112
NSN 5925-01-541-5465
NSN 5835-01-162-8353
NSN 5915-01-287-8188
NSN 6110-00-991-2395
NSN 6150-00-005-8579
NSN 6135-00-235-1938
NSN 5960-01-151-1152
NSN 5905-00-104-8096
NSN 5935-00-529-0921
NSN 5975-01-453-2070
NSN 5930-01-384-2820