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 6620-01-081-1042
NSN 6220-00-119-8630
NSN 6220-00-291-3722
NSN 5975-01-155-4856
NSN 6645-01-593-6149
NSN 6105-01-316-4774
NSN 6320-01-144-3810
NSN 5835-01-177-1092
NSN 5975-01-634-0678
NSN 6145-01-114-5593
NSN 5998-00-333-7340
NSN 5990-01-176-2724