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 5965-01-419-4202
NSN 5905-01-661-2492
NSN 6610-00-441-0523
NSN 5990-01-582-5238
NSN 5985-00-940-9872
NSN 5975-00-688-4625
NSN 5935-00-672-2913
NSN 2925-01-155-5444
NSN 6650-01-179-9349
NSN 7035-01-623-2144
NSN 5855-00-973-5717
NSN 6645-01-593-8190