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 6620-00-763-1136
NSN 6610-01-567-7242
NSN 5910-01-357-6484
NSN 5998-01-491-5750
NSN 5985-01-200-7497
NSN 5895-00-683-4517
NSN 5999-01-568-7586
NSN 5990-00-115-5851
NSN 6645-00-244-0359
NSN 5945-01-583-8144
NSN 5915-01-170-4308
NSN 5945-01-350-4132