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 7035-00-557-5570
NSN 5920-00-075-9904
NSN 6320-01-335-8336
NSN 6610-01-500-0863
NSN 5960-01-605-9921
NSN 5855-01-417-3250
NSN 6240-01-382-2528
NSN 6135-01-408-0313
NSN 5935-00-885-9397
NSN 6105-01-323-7679
NSN 5975-01-145-3768
NSN 5935-01-152-1241