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 5905-00-010-8077
NSN 5925-00-580-0869
NSN 5925-01-653-8366
NSN 5930-00-472-4423
NSN 5920-01-657-4794
NSN 5996-01-008-4456
NSN 5999-01-516-2661
NSN 6110-01-319-4070
NSN 5835-01-394-3812
NSN 5855-01-100-3272
NSN 2925-00-238-1668
NSN 5905-00-957-1284