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 6320-01-569-2672
NSN 5925-01-380-9887
NSN 5895-01-540-6087
NSN 2925-00-862-8550
NSN 6105-01-653-2629
NSN 5895-00-905-5730
NSN 6105-01-340-0710
NSN 5990-01-633-9503
NSN 5910-00-001-3912
NSN 6650-00-626-1891
NSN 6320-00-036-3688
NSN 6320-01-253-1028