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 6620-01-112-6440
NSN 5985-00-022-8599
NSN 6110-01-188-8017
NSN 5945-01-155-3722
NSN 5835-01-147-7526
NSN 5975-01-146-4240
NSN 5990-01-100-1840
NSN 5910-01-403-2812
NSN 6610-01-409-1781
NSN 5975-00-727-3678
NSN 5975-00-995-2855
NSN 6220-01-608-5611