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 6240-00-854-1962
NSN 6645-01-029-4525
NSN 5999-01-422-5492
NSN 6610-00-827-8959
NSN 6105-01-559-1826
NSN 6685-01-204-9005
NSN 4140-00-820-1173
NSN 5905-01-390-3987
NSN 5965-00-653-4782
NSN 6320-00-894-1644
NSN 5915-01-587-1692
NSN 6135-01-627-3786