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 5945-01-649-1372
NSN 6220-01-631-2972
NSN 5905-01-056-5095
NSN 5915-00-755-9664
NSN 6650-01-597-7802
NSN 5920-00-258-6822
NSN 5895-00-565-3229
NSN 5925-01-476-3541
NSN 6610-01-596-3254
NSN 6110-00-547-8762
NSN 5855-01-518-4406
NSN 5960-00-289-6591