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 6645-01-633-1852
NSN 6220-01-441-2249
NSN 5895-00-467-5032
NSN 5975-01-149-4531
NSN 6650-01-353-7809
NSN 6130-01-136-5726
NSN 6135-00-998-5884
NSN 5905-01-067-4890
NSN 5910-01-209-6755
NSN 5895-00-258-3058
NSN 5930-00-456-6698
NSN 6105-01-376-5902