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 5930-00-036-0381
NSN 5990-00-835-5211
NSN 6110-00-821-5534
NSN 6240-01-255-5080
NSN 5999-01-510-6597
NSN 6610-01-371-3006
NSN 5835-01-023-6774
NSN 5935-01-176-0026
NSN 7035-01-278-1379
NSN 4140-00-798-9144
NSN 5925-01-528-9051
NSN 6320-00-456-2092