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 5915-01-564-7706
NSN 5905-00-254-2332
NSN 5920-01-585-9616
NSN 5925-01-105-5254
NSN 5935-01-449-8889
NSN 5930-00-224-2748
NSN 6620-01-217-3216
NSN 6105-00-216-5813
NSN 5950-01-364-0006
NSN 5935-01-556-1816
NSN 5925-01-480-6114
NSN 5999-00-464-2209