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 6685-00-190-1217
NSN 5975-01-315-9586
NSN 6645-01-232-4843
NSN 6105-01-600-9620
NSN 6130-01-115-3268
NSN 5945-01-452-1067
NSN 6620-00-193-0518
NSN 5905-01-140-3046
NSN 6240-00-456-2578
NSN 5930-01-581-3702
NSN 5930-01-112-0157
NSN 6610-01-105-9520