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 6135-01-575-5061
NSN 5855-01-369-4192
NSN 5960-01-089-8155
NSN 6145-01-068-4668
NSN 5920-01-383-5963
NSN 5925-00-437-2854
NSN 5990-00-696-5533
NSN 6685-01-461-4057
NSN 6685-01-401-5360
NSN 6145-00-162-7394
NSN 5835-01-229-6964
NSN 6145-00-557-9447