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 5905-01-039-0581
NSN 7035-01-364-0286
NSN 5975-01-244-2268
NSN 4140-01-542-5522
NSN 6145-00-414-5315
NSN 5985-01-346-4236
NSN 6150-01-089-4806
NSN 6320-00-468-8421
NSN 5925-01-522-8369
NSN 5910-00-084-0275
NSN 5915-00-078-7381
NSN 5930-00-130-2587