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 5855-01-505-5144
NSN 6135-01-154-3526
NSN 6130-00-027-5186
NSN 6610-01-033-2402
NSN 5895-00-596-8678
NSN 6240-01-289-9898
NSN 6220-01-430-4268
NSN 5965-01-376-9305
NSN 5855-00-114-4954
NSN 5965-01-184-2477
NSN 5996-00-201-6921
NSN 6240-00-138-3082