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 5910-01-409-9230
NSN 2925-01-408-9485
NSN 5925-00-666-4753
NSN 6320-00-809-5744
NSN 6650-01-398-1884
NSN 5998-00-828-4059
NSN 6110-01-233-1532
NSN 5998-01-400-3582
NSN 5998-01-385-4880
NSN 5920-00-416-5999
NSN 6150-01-648-4012
NSN 5935-00-928-2804