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 5996-00-865-9096
NSN 6110-01-394-5302
NSN 5975-00-477-7197
NSN 4140-01-254-2739
NSN 5920-01-497-6857
NSN 6110-01-442-8080
NSN 6220-01-251-9299
NSN 5855-01-540-6522
NSN 5998-00-332-9558
NSN 5990-01-186-8310
NSN 6650-01-384-1657
NSN 6135-01-359-4293