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 5996-01-400-3558
NSN 5910-00-227-9795
NSN 5960-01-383-6262
NSN 5835-01-522-9881
NSN 6150-01-583-7301
NSN 5950-01-440-0496
NSN 5999-01-631-1051
NSN 6105-01-557-4372
NSN 5975-01-594-5389
NSN 6645-00-432-3420
NSN 4140-00-397-9252
NSN 5990-00-760-7474