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 6610-01-361-8965
NSN 4140-01-109-3882
NSN 6145-00-583-9989
NSN 5985-01-113-7837
NSN 5990-01-330-4552
NSN 6130-00-823-8481
NSN 6110-01-431-4257
NSN 6650-01-102-1452
NSN 5905-00-003-6281
NSN 5950-00-555-2881
NSN 5855-01-096-9294
NSN 5945-00-773-8034