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 5999-00-715-0872
NSN 2925-00-221-4977
NSN 5930-01-540-0274
NSN 5998-01-053-4305
NSN 5935-01-363-9720
NSN 5905-01-250-2608
NSN 5910-01-198-8975
NSN 6110-01-570-5761
NSN 6320-01-064-0372
NSN 5910-01-324-8438
NSN 5998-01-460-9530
NSN 5855-01-442-2322