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 5920-00-722-4894
NSN 5835-00-813-1724
NSN 5950-00-995-4763
NSN 6145-00-468-8534
NSN 6105-01-541-5201
NSN 6645-01-333-9336
NSN 6650-01-397-6325
NSN 6620-01-248-0358
NSN 2925-01-430-4206
NSN 5965-01-494-8969
NSN 6620-01-287-1443
NSN 6150-01-314-0441