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 5975-01-234-9254
NSN 5965-00-227-7348
NSN 5925-01-323-6491
NSN 6650-01-452-1167
NSN 6150-00-943-8767
NSN 4140-01-315-3959
NSN 2925-00-167-6762
NSN 6320-01-054-3046
NSN 5975-01-068-4125
NSN 6240-01-563-9037
NSN 6685-01-413-4632
NSN 6135-01-442-4581