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 6645-01-620-0044
NSN 5905-01-511-8672
NSN 5985-00-414-2655
NSN 5920-01-435-5091
NSN 6130-01-555-8062
NSN 4140-01-581-6728
NSN 6110-01-338-6746
NSN 6650-01-298-4138
NSN 5985-00-529-0093
NSN 6240-00-557-7471
NSN 6645-00-241-3280
NSN 5930-01-592-1112