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 5985-01-448-6988
NSN 6220-00-084-0174
NSN 6145-00-617-4032
NSN 6320-01-631-7828
NSN 6650-00-207-9639
NSN 6685-01-345-4834
NSN 6145-01-360-1238
NSN 6650-00-515-6002
NSN 6220-00-484-5937
NSN 5990-00-956-9130
NSN 5935-01-659-7640
NSN 6620-00-273-8735