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 5950-01-163-0363
NSN 6145-00-141-8095
NSN 5985-01-012-2025
NSN 5960-01-553-4557
NSN 5925-01-538-5747
NSN 6105-01-120-1092
NSN 5925-01-044-5508
NSN 6610-01-397-6965
NSN 6620-00-244-0965
NSN 4140-01-315-0460
NSN 5895-00-737-4831
NSN 2925-01-334-7122