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 6150-00-058-4092
NSN 5905-01-431-5232
NSN 6135-00-577-8429
NSN 6105-01-159-3677
NSN 5965-01-281-9916
NSN 6320-00-937-5625
NSN 6135-00-932-3136
NSN 6240-00-104-4662
NSN 5965-01-264-1738
NSN 6220-00-226-1994
NSN 5960-00-161-3728
NSN 6110-01-571-8717