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 5895-01-446-6768
NSN 5990-01-438-8228
NSN 5965-01-198-3256
NSN 5920-01-046-1062
NSN 6135-01-059-4055
NSN 6620-01-555-5218
NSN 6220-01-390-4090
NSN 6650-01-425-1934
NSN 6610-00-400-1252
NSN 4140-01-034-9806
NSN 5960-00-803-8765
NSN 6135-00-777-5562