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 5915-01-519-3287
NSN 5935-00-515-2131
NSN 5895-00-372-5493
NSN 7035-00-347-5537
NSN 5895-00-704-9295
NSN 6685-01-576-9843
NSN 5990-00-155-2306
NSN 2925-00-120-9302
NSN 5998-00-107-5461
NSN 5965-00-147-3070
NSN 5998-00-443-5057
NSN 6685-01-398-7371