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 5905-01-587-0710
NSN 2925-00-720-3948
NSN 5990-00-170-4239
NSN 6135-01-502-5787
NSN 6145-00-181-9622
NSN 7035-00-008-4173
NSN 6130-01-374-7482
NSN 2925-01-359-4027
NSN 5996-01-571-9384
NSN 6650-00-031-8467
NSN 4140-01-215-1125
NSN 6145-00-351-4539