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: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 6110-00-653-3936
NSN 6620-00-246-5159
NSN 6150-00-683-5349
NSN 5998-00-529-8635
NSN 4140-00-773-6474
NSN 5895-01-469-3352
NSN 6135-01-371-9209
NSN 2925-01-620-9673
NSN 6620-01-534-7180
NSN 6685-01-334-4467
NSN 5935-00-470-0015
NSN 4140-00-435-5607