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 6220-01-642-8678
NSN 5915-01-158-5602
NSN 6105-01-422-9501
NSN 4140-01-186-3977
NSN 5925-01-034-9288
NSN 5975-01-049-2927
NSN 5965-01-533-7687
NSN 5915-01-310-6070
NSN 5945-01-296-9845
NSN 5996-00-038-8276
NSN 6685-01-265-5107
NSN 5905-01-204-1960