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 2925-01-033-8948
NSN 5998-01-090-6290
NSN 6610-01-431-8575
NSN 6685-00-412-1258
NSN 5945-00-469-3516
NSN 6110-01-094-8576
NSN 6110-01-104-9589
NSN 5910-00-104-5953
NSN 6620-01-600-0479
NSN 5960-01-219-5504
NSN 5910-00-125-2426
NSN 5990-01-126-5824