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 6240-01-502-7883
NSN 6105-00-941-6493
NSN 6685-00-111-1123
NSN 5895-01-128-1801
NSN 5935-01-082-1969
NSN 5945-01-432-4977
NSN 5998-00-155-7737
NSN 5998-01-107-1119
NSN 5990-01-572-3137
NSN 6610-01-353-3255
NSN 7035-01-397-5009
NSN 6650-00-973-9533