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 5998-00-848-9137
NSN 4140-01-325-2955
NSN 6130-00-280-3696
NSN 2925-01-364-7926
NSN 6150-01-361-4352
NSN 5960-00-372-4876
NSN 5855-01-634-0259
NSN 5925-00-902-3240
NSN 6240-01-384-8802
NSN 5999-00-327-1401
NSN 6650-01-170-4397
NSN 6320-01-519-0916