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 5930-00-359-8891
NSN 5965-01-442-0490
NSN 6685-01-151-3473
NSN 5996-00-373-9001
NSN 5965-00-705-1690
NSN 6110-01-549-6184
NSN 6105-01-656-3715
NSN 5895-01-368-8662
NSN 5895-00-115-1500
NSN 7035-01-205-1478
NSN 6610-00-451-0590
NSN 6150-01-143-8242