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 5960-01-649-1341
NSN 5990-00-591-0991
NSN 5905-00-391-9860
NSN 6150-00-231-3689
NSN 5835-00-018-4571
NSN 6650-00-195-7519
NSN 6610-01-633-8931
NSN 2925-00-918-0859
NSN 5920-01-432-5783
NSN 5996-00-927-7729
NSN 5990-01-338-2103
NSN 5985-01-415-6259