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 5999-01-557-9159
NSN 5950-00-928-4228
NSN 5996-00-813-7422
NSN 6645-01-116-3423
NSN 2925-00-542-8285
NSN 6685-01-587-4050
NSN 5930-00-651-5631
NSN 6620-00-829-1860
NSN 4140-01-070-4928
NSN 6150-01-112-3968
NSN 6620-01-448-0572
NSN 5998-00-309-4466