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 5905-01-113-6821
NSN 5920-01-273-8782
NSN 6105-01-087-0454
NSN 5996-01-014-3681
NSN 6620-01-259-5944
NSN 2925-01-280-1911
NSN 6650-00-193-7358
NSN 6105-00-187-0094
NSN 5915-01-464-8936
NSN 5835-01-328-6626
NSN 5905-01-429-9943
NSN 6220-01-418-9314