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 5960-00-273-2446
NSN 5999-01-220-2617
NSN 6220-00-083-7787
NSN 6135-01-567-0739
NSN 5975-01-411-7471
NSN 5990-01-268-2236
NSN 5999-01-053-7692
NSN 4140-00-679-9512
NSN 6650-00-144-4555
NSN 5930-01-391-6861
NSN 2925-01-157-9204
NSN 6110-01-068-6483