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 5945-01-511-0435
NSN 5960-01-384-4603
NSN 5920-00-138-5241
NSN 6105-01-208-4930
NSN 6220-00-411-3544
NSN 6610-01-048-2870
NSN 5895-00-903-1237
NSN 6135-01-091-6021
NSN 6135-00-027-3914
NSN 5925-01-655-7398
NSN 5910-01-533-7838
NSN 5950-01-527-4948