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 5998-01-144-8096
NSN 6685-01-168-4754
NSN 6645-01-386-6311
NSN 6150-00-712-0256
NSN 5930-01-159-5781
NSN 7035-01-160-4423
NSN 5960-01-391-8860
NSN 5835-00-707-6266
NSN 5920-00-895-3270
NSN 6150-01-260-9137
NSN 5999-01-447-3153
NSN 5905-01-549-6097