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 6135-00-548-2765
NSN 5920-01-363-4163
NSN 6130-00-995-9095
NSN 6130-01-278-9831
NSN 4140-00-787-1315
NSN 5999-01-531-5295
NSN 6320-01-176-8367
NSN 5835-01-651-6652
NSN 6620-00-932-8989
NSN 5920-01-411-3493
NSN 6320-00-519-0770
NSN 5835-00-147-9328