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 6145-00-435-9296
NSN 5855-01-077-6264
NSN 4140-01-163-4350
NSN 5855-00-058-1293
NSN 5960-01-449-1310
NSN 5999-00-599-1705
NSN 6110-01-174-3161
NSN 5920-01-336-2259
NSN 5915-01-223-4238
NSN 5935-01-493-4353
NSN 5945-01-378-6860
NSN 6240-01-625-7262