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 5925-00-529-0441
NSN 5920-01-069-9833
NSN 5945-01-242-9389
NSN 5996-01-122-6162
NSN 5945-00-909-2376
NSN 2925-00-735-4979
NSN 6240-00-985-5244
NSN 5910-01-415-5758
NSN 5935-00-995-2274
NSN 5925-00-035-8469
NSN 5985-00-368-7198
NSN 6685-01-399-6670