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 5910-01-254-2799
NSN 5950-01-281-8342
NSN 5998-00-631-1540
NSN 6105-01-299-3114
NSN 5945-01-485-8836
NSN 5965-01-146-9162
NSN 5950-00-175-3178
NSN 5930-00-216-1996
NSN 5990-00-583-3726
NSN 6650-01-575-8326
NSN 5998-00-394-5871
NSN 5905-01-191-5894