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 5920-01-170-3464
NSN 5895-01-265-1095
NSN 5999-01-257-5591
NSN 6220-01-390-4090
NSN 6240-01-262-2039
NSN 6240-01-513-4545
NSN 5930-01-020-8068
NSN 5925-01-423-7429
NSN 6150-00-909-9895
NSN 5985-01-512-1227
NSN 6610-01-207-0045
NSN 4140-01-517-4807