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 5855-01-254-3041
NSN 5920-01-394-5003
NSN 6240-01-633-9357
NSN 4140-01-608-2108
NSN 6320-00-098-2858
NSN 6110-01-599-1541
NSN 6150-00-768-9848
NSN 6320-01-380-0561
NSN 5945-00-685-9337
NSN 6130-01-033-8533
NSN 5960-01-495-0859
NSN 4140-01-660-5997