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 6240-01-463-7057
NSN 6145-01-358-0176
NSN 6105-00-664-1292
NSN 5985-01-489-7056
NSN 6220-01-582-8552
NSN 6130-01-540-6601
NSN 5960-01-037-4809
NSN 6320-01-291-4870
NSN 5935-01-382-9109
NSN 6135-01-116-3385
NSN 5935-00-503-8645
NSN 6645-01-514-0236