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 6150-01-022-4437
NSN 5835-01-328-6626
NSN 5835-00-710-7537
NSN 5998-01-398-5517
NSN 5950-01-036-2062
NSN 2925-01-495-2690
NSN 6220-00-944-4512
NSN 6320-01-364-1840
NSN 5855-01-400-1590
NSN 6130-01-024-1679
NSN 6620-00-104-6937
NSN 6135-00-228-8140