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 5905-00-991-3356
NSN 5990-01-211-6136
NSN 5935-00-727-5700
NSN 5998-01-450-3043
NSN 6145-01-316-0878
NSN 5935-01-577-1661
NSN 6130-00-326-3680
NSN 6685-01-057-7720
NSN 5960-01-114-8152
NSN 6110-01-196-5496
NSN 5965-00-917-0455
NSN 6240-01-589-7218