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 6650-01-338-9998
NSN 5990-01-100-1840
NSN 5965-01-088-5414
NSN 5965-01-160-9819
NSN 6320-01-425-1417
NSN 5855-01-535-4420
NSN 5915-01-368-5668
NSN 5999-01-584-0549
NSN 6645-00-051-8888
NSN 5960-01-100-5065
NSN 5998-00-238-9418
NSN 5950-01-652-8426